Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e63100c99b9db1…

MALICIOUS

PDF

53.6 KB Created: 2020-10-28 18:16:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2a15c2663b3d887ce358a8e770946b76 SHA-1: 9d382acc84b7731eb740f76a12193bf95fce5f66 SHA-256: a8e63100c99b9db16f931afe6e859f84ada9b45e59e0351b6df084c7031c3467
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to a redirector URL (https://ggtraff.ru/strik?keyword=king+snake+arizona), indicating a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the overall structure suggest an attempt to direct users to malicious content, likely for phishing or malware delivery.

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=king+snake+arizona In PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/kevakebaminogi-xitebililepavur-bofinog-bikug.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/fubisi.pdfIn PDF document text
    • https://nuzixusimupe.weebly.com/uploads/1/3/4/3/134306281/mubofamabusokad_pedugas.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/suvukoneves-wufujovaxojot.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/lotiwaridufa_pufasimaza_guxasiduwesak.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/wotukomomig-safozepogadala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/bring_up_genius_francais.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/bravo_720_ficha_tecnica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c16173a-d006-44e5-a081-6f323405603f/masatafidubotopozo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7374/7140/files/marathi_calligraphy_letters.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6147/7527/files/68024503698.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/weight_gain_smoothies_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0954cd-2151-4beb-8b8c-b8f486a8ddc9/19001904117.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6525/2769/files/oil_and_gas_middle_east.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7616/5042/files/jefowazupekixanova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9155/8551/files/tylenol_500mg_bula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/5540/8071/files/84813612420.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84FC 4904 bytes
SHA-256: 0af5462083faac6a725464eeaa5eeb4fb939fb400e3bf2b9cca131010405d2e0
font_01_sfnt_off000095c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95C6 1716 bytes
SHA-256: 70b844f74996fcee5e1d27ce90af7085dab18ef8498285b96f5f41c426451930
font_02_sfnt_off00009e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E6C 13184 bytes
SHA-256: 8e71ed28338254133325762f72d83528604c866b0d6ffb29188b8b2014713341