Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3d68789291ecc8…

MALICIOUS

PDF

49.9 KB Created: 2020-07-27 10:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c647756b37b8a52812aad5bf2c5cf44d SHA-1: e67b8e102ae8dfe656bc8ed66dddcee302ac5682 SHA-256: ba3d68789291ecc88757dbcdf053a86e93176b30c6ebdf092b9f672b5a2b052c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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/wb?keyword=brief%20answers%20to%20the%20big%20questions%20pdf%20espa%C3%B1ol
    • http://files.apentertainment607.com/uploads/1/3/0/8/130873718/kuzotukuwiku.pdf
    • http://files.assertion-evidence.com/uploads/1/3/1/4/131453904/misulofoxope.pdf
    • http://files.lochgoin.com/uploads/1/3/1/6/131607239/gutexal.pdf
    • http://files.pacificcascadefarms.com/uploads/1/3/1/3/131381919/f49353d0da7aa5.pdf
    • http://files.assertion-evidence.com/uploads/1
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/wetazekivaxezurumafos.pdf
    • https://cdn.shopify.com/s/files/1/0437/7218/2685/files/70324359608.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/4195889477.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8298/files/vebelibabowonizu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/18847991577.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/rosifemod.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/99456189153.pdf
    • https://cdn.shopify.com/s/files/1/0433/2286/7880/files/57777098448.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/xuworuxufa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/kovebudifoxitokasaparuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/wajiroput.pdf
    • https://cdn.shopify.com/s/files/1/0433/3250/1656/files/65043566284.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8743/files/wubonapetakufaruzokinu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1347/9320/files/40908314479.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_off000079ba.bin
db991399d5a7bea1eeb6ffd43f501123eed3882ab7aa220ddcbf6626e547c420		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79BA 5804 bytes
font_01_sfnt_off00008d33.bin
3a92f89f453a010e5eff18ddaad5cc1e5d80099e5831903e6a61a2a6b23f3069		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D33 13544 bytes

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