Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98a5b9d7e8711f2…

MALICIOUS

PDF

103.3 KB Created: 2020-10-30 14:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b750fd05ad109c37ec089d0baf8dc9b SHA-1: 90a978bd520daa782d03997f828a9501afd8fea2 SHA-256: a98a5b9d7e8711f22dbd603003f3f37831bf13e0bbdd3c19a01dc8e55eb73814
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a reference to the malicious URL. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • 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/aws?keyword=apptoko+apk+minecraft
    • https://cdn-cms.f-static.net/uploads/4393901/normal_5f98981dbe176.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0499/5599/5801/files/arrow_arterial_line_kit_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0495/4741/1608/files/vba_select_worksheet_range.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/zudud.pdf
    • https://cdn.shopify.com/s/files/1/0495/4973/8136/files/jugadores_de_voleibol_mas_bajos.pdf
    • https://uploads.strikinglycdn.com/files/aeeab139-1af5-429b-bc1e-e61cb146c1c9/tirinha_com_adverbio_com_gabarito.pdf
    • https://cdn.shopify.com/s/files/1/0482/9462/5441/files/24560274655.pdf
    • https://uploads.strikinglycdn.com/files/9dc40d49-9d54-4e37-b22c-47156645e2ae/47731829095.pdf
    • https://cdn.shopify.com/s/files/1/0494/4465/1167/files/cleopatra_halloween_costume_party_city.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015766.bin
fab9961d3a7c982e51cd537a157b7589ba69ce1d6cf514015c0a3fd223a42432		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15766 5004 bytes
font_01_sfnt_off0001685e.bin
0ba629201d71b7ca77a2c06dcdd523ebad9feb18cb9652ddb5aac9856b10c05d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1685E 12216 bytes

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