Malicious PDF — malware analysis report

Static analysis result for SHA-256 742f759b3a6b0d7d…

MALICIOUS

PDF

50.8 KB Created: 2020-08-19 17:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1ece554c0ebdc164582abebec55ce0b SHA-1: 8e3042bc10baca9506b01f83a6e1500de66fe96c SHA-256: 742f759b3a6b0d7d07c8e3fa259be31667e4c0c89e7af6e1e9582f9a5b05a6ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to funnel victims to further malicious content. The document also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which point to benign Shopify domains, likely to improve SEO and disguise the malicious intent. The ML classifier strongly indicated maliciousness.

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.com/pify?keyword=b+lactam+antibiotics+pdf
    • http://files.prabeer.org/uploads/1/3/0/7/130740158/38bd36c41.pdf
    • http://kewifoke.reedworkz.com/uploads/1/3/1/1/131164250/fcc00ab989951a.pdf
    • http://files.charteredengineers.org/uploads/1/3/2/7/132712508/6ae92.pdf
    • http://files.mobyarchitecture.com.au/uploads/1/3/1/6/131606630/7951763.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/primary_health_care_definition_according_to_who.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/pikesobekazuwubax.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2384/files/51445295681.pdf
    • https://cdn.shopify.com/s/files/1/0428/4973/0727/files/wajanidegasadadimepel.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/ethical_leadership.pdf
    • https://cdn.shopify.com/s/files/1/0431/5915/8946/files/93056863945.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/lixibigi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8582/files/anatomy_of_dog_eye.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81159011373.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8024/files/50283435267.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cbc.bin
61037fde9ffd9e2c3e3cbbde342971f2e3bdb88a427c43bbd893670a7bdc3489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBC 5064 bytes
font_01_sfnt_off00008dcc.bin
306a4f363e60f4a3b65704ca49319399f3b0b0b9b3e965a9d4c9c73fe161bed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DCC 10168 bytes
font_02_sfnt_off0000b091.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB091 4324 bytes

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