Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25719661aa855ee…

MALICIOUS

PDF

48.1 KB Created: 2020-10-29 04:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ecccef2579a55d30a1445601ae09a96a SHA-1: 49c7dc77cc9991c30c9fc4c938dc355c0a514a93 SHA-256: f25719661aa855eec87b56275f421884970312894b85a1ff6a43ff8ff0c4eb50
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically `https://ggtraff.ru/strik?keyword=sea+snakes+venomous`. It also features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=sea+snakes+venomous In PDF document text
    • https://voxipomawo.weebly.com/uploads/1/3/1/3/131379395/rivinepaso.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/xekukuw-forolopofezej-latiwigekiz-parapevu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0482335-66f1-4191-83df-2a98579e0a69/what_is_a_drow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/4518/1342/files/wuxaxemomifedi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8842/7181/files/first_aid_handbook_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/atharva_veda_in_gujarati_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1d3663-8255-4c49-9486-298cc6436b13/tunnels_and_trolls_solo_adventures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdcb994b-865e-4bc1-bcad-0b0828c1ea0e/xavas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4001abee-9f1d-4730-bc34-1b66486ccf56/24471854227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96ed758d-6914-4701-8cb1-52d2d58feaf9/vugalujuzoguge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2197/8778/files/forza_horizon_3_mod_apk_revdl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a745728c-5e0f-4cf0-95ee-d1f51b362493/growing_blueberries_in_oregon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1111/9527/files/cloistered_away_gift_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/66238084848.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6814/3765/files/north_fond_du_lac_weather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa37f56-b5e8-48f8-9e57-dba368c2fe66/kowifiworetej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1019/5107/files/vevezexewoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb0ca9d-3b57-46d5-99ef-7cff8e407964/excel_tC3BCrkiye_haritasC4B1_indir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6207/3793/files/zepipepuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0593/7317/files/find_zeros_of_polynomial_ti-84.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/der_blechtrommel.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0D 4928 bytes
SHA-256: 16de9d48e9104a3dbe5b200a269a69114690382243cc9b9ba549bfd4a57b29f8
font_01_sfnt_off00008ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCB 11508 bytes
SHA-256: c99b03a9ec9f97880252e05453bdd084b9c52af48f54a3511fca9798bcbfff01