Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6a1cafb68e424e…

MALICIOUS

PDF

34.0 KB Created: 2020-09-08 14:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 216176dc24dd016e99404c8dde0d693c SHA-1: f9c82710fcc068fd8f8f3e8b5b15747c08eaa25e SHA-256: fa6a1cafb68e424ed6a704b1b56ca3209bc32c45d10eaaa8f464feb5f986bd9f
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/pify?keyword=autocad+guide+book+pdf', which is also present in the heuristics. This URL is likely used to redirect users to a phishing or malware-hosting site. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources.

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.club/pify?keyword=autocad+guide+book+pdf
    • https://cdn.shopify.com/s/files/1/0463/3391/9393/files/oculus_rift_dk2_setup_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/2113/9096/files/55616381637.pdf
    • https://cdn.shopify.com/s/files/1/0436/3816/1561/files/belajar_pivot_table_excel_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/transformer_restricted_earth_fault_protection.pdf
    • https://static.usrfiles.com/ugd/136d3d_5d2d72ecd1b5476893d4c139e7f434d9.pdf
    • https://static.usrfiles.com/ugd/d1fcfc_6f411b45b7544daab9f4bf88bce4c9ec.pdf
    • https://static.usrfiles.com/ugd/cece23_7d50c10262dd4985839577605853862c.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4744/files/rosapajan.pdf
    • https://cdn.shopify.com/s/files/1/0436/0201/8467/files/satyanarayana_biochemistry_archive.pdf
    • https://cdn.shopify.com/s/files/1/0438/2857/6416/files/nolutugirazawo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/benafek.pdf
    • https://cdn.shopify.com/s/files/1/0428/6011/8175/files/73415734935.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4573/files/autumn_leaves_trumpet_solo.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4699/files/oster_versa_1100.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3403/files/53361628733.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4634/files/tabonipexiji.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_off000046c7.bin
1afa06fde68c5e91721710cda2084cdf90f659d0a2934e9fb0640494481e15fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46C7 5212 bytes
font_01_sfnt_off000058a1.bin
de8e5dec1e2ebc62b422ad188db51d13602c4fd3302b043cb37616bd0f0db304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A1 9928 bytes

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