Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1ea49c86d2eb16…

MALICIOUS

PDF

38.2 KB Created: 2020-11-08 09:28:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: e5be24ac6d53f3b9acd9052058c7619b SHA-1: b29e0959979c40efa7497aa49d646882003d278d SHA-256: 7a1ea49c86d2eb164d685be306332b24aad48e0e65327c1977a8162927ca67ef
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to redirector infrastructure. One prominent link, disguised as an answer key, leads to 'traffking.ru', a known malicious redirector. This suggests a phishing or scam attempt designed to drive traffic to malicious sites, likely for further exploitation or credential harvesting.

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://traffking.ru/123?keyword=population+biology+virtual+lab+answer+key In PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/bimumuwijujonilad.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/17ae5dda-1e72-42c6-be6a-3934add6c153/98856926311.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/biostatistics_for_the_biological_and_health_sciences_triola.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/excel_calendar_template_2019_2020_editable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d12fc6-59b6-4a9e-af39-cbaf86e90775/tebokizifu.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/trastornos_alimenticios_en_nios_y_adolescentes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e813ff-abe7-41f4-becf-020cbdf49e3b/tongue_drum_vst.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/79250871936.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/zuwuduvesokuj.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/jojosenev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a88bbac-6bca-4258-97fb-80212aed2f7b/kurtlar_vadisi_filistin_full_hd_izle.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/23840935832.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_off00004e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E12 5444 bytes
SHA-256: 1816f99408b5530b5a17a16073784e6b68924696c1d1cebd4139e0e55a7e1a39
font_01_sfnt_off000060c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C0 13616 bytes
SHA-256: aa8719a3cb559c251f7f0594ce33f80e7313a56934ac98f4f438b4d58a91a198

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