Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8c6665833b7081…

MALICIOUS

PDF

61.5 KB Created: 2020-08-26 02:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eba07feb2186989b96db63123a22c666 SHA-1: b0b1f6fa7381c6b6f9cc5bfe92fc214f6f723e9e SHA-256: bf8c6665833b70813554b0ae55fe6f0be25d6ed7f5515220c97dd45fa0444bab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a prominent link that, when clicked, redirects to a malicious URL. The document body and heuristics indicate this is a lure, likely for phishing or malware delivery, using the pretext of 'Makarov disassembly instructions'. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ttraff.cc/pify?keyword=makarov+disassembly+instructions
    • http://files.agardenforknitters.com/uploads/1/3/1/4/131453651/ledudimijiwifiz-vatewi-zatus.pdf
    • https://cdn.shopify.com/s/files/1/0436/4288/0160/files/soroxakepijedomilaze.pdf
    • https://cdn.shopify.com/s/files/1/0435/2730/7423/files/university_physics_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7404/3556/files/js_remove_class.pdf
    • https://cdn.shopify.com/s/files/1/0428/7778/0134/files/bikiluxebopavap.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32150460784.pdf
    • https://cdn.shopify.com/s/files/1/0434/9650/5496/files/fowimisapovukowititerave.pdf
    • https://cdn.shopify.com/s/files/1/0431/8724/1119/files/xivejepuwef.pdf
    • https://cdn.shopify.com/s/files/1/0461/4396/3299/files/fast_and_furious_7_in_hindi_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0429/5367/0822/files/59977809699.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/acs_general_chemistry_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5831/4912/files/loxovodobokifovel.pdf
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/81138008471.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1ef.bin
03eb7616255903628d8351df388ede37d6cb102930cd77ed1f82d0eba7332c52
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 5456 bytes
font_01_sfnt_off0000c477.bin
f364d158b978cdb9a5f191ca498b81e329d1b86d9a7a91ca0a5d73812dae01b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC477 10760 bytes