Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc09a347f88023c…

MALICIOUS

PDF

34.9 KB Created: 2020-08-23 17:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9136dd008423a2896541a9bafc073fa SHA-1: 9d7f14b5fdc3ea90592be14cdabbb98c5a69a318 SHA-256: 0dc09a347f88023c57d93d4a1cc6c928d96da3d0b5a9725672bd2ad4abe17525
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to movie titles and the authoring application, suggesting a lure. The presence of many external PDF links, some pointing to benign Shopify URLs and others to unknown domains, indicates a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious.

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=aaru+movie+audio+song++masstamilan
    • http://files.kristabelanger.com/uploads/1/3/1/3/131382955/kuwip.pdf
    • http://zeteduvi.appleridgecooperativehomes.com/uploads/1/3/0/7/130776445/6985718.pdf
    • http://files.clareandkatie.com/uploads/1/3/0/7/130776445/0d2739f10c9bf13.pdf
    • http://files.sutherlandbeatson.com/uploads/1/3/1/6/131606875/jirekomiv-morilewurewox-vakezuvevobido-welos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7525/3910/files/programming_abstractions_in_c_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0146/files/jejixajebugaziwokog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.pdf
    • https://cdn.shopify.com/s/files/1/0446/8090/4857/files/siwufol.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/zogixugadojoxabidakezug.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/mesekolirakuporukira.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/rigop.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/91522721666.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4840/files/d_d_5e_favored_soul.pdf
    • https://cdn.shopify.com/s/files/1/0440/6178/6262/files/prawo_o_notariacie.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/72428877196.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/36774755205.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_off00004af0.bin
dc88aa82dbdfd899b91ea10cc8e3e24504936a2ba0ee7b077e3871343969d844		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF0 5196 bytes
font_01_sfnt_off00005c88.bin
6eaf25b9056fda2defbb4bef00afe2f359e1cf76f7ff3b1c5bbc32374279aa83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C88 10008 bytes

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