Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fd55f4c141d934…

MALICIOUS

PDF

47.0 KB Created: 2020-08-03 23:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14eeeffcac08bf639c0875d56ec2d0d4 SHA-1: 7dfae1dfc299e93336f4b547869d2c0111929a9b SHA-256: 63fd55f4c141d9345e4e1c51b78b778285a47df4479a877013894d5ff1639ffd
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which are to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical finding is a link to a known malicious redirector, ttraff.com, which is disguised with a seemingly benign keyword. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the nature of the heuristics indicate a phishing or redirection attempt to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=exercises+for+shoulder+arthritis+pdf
    • http://files.davislab.ca/uploads/1/3/1/1/131164081/dirapuxovo.pdf
    • http://files.miriamruberlartist.com/uploads/1/3/1/4/131483019/828517e6fc26dc2.pdf
    • http://files.pcaguild.com/uploads/1/3/2/6/132696598/senod.pdf
    • http://files.scrimsmustangclassicyamahadtrestoration.com/uploads/1/3/1/6/131637178/xisurewunatu_xivit.pdf
    • http://files.kellybellecrystals.com/uploads/1/3/0/8/130814169/9b560a634c89a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/1391/5303/files/wodesafisozaxubosed.pdf
    • https://cdn.shopify.com/s/files/1/0439/5863/2606/files/xubolonuwulukabovi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0134/7226/files/pumafakudaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5454/files/22649380186.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2892/files/60484773142.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/house_of_night_betrayed_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/kabamolarosel.pdf
    • https://cdn.shopify.com/s/files/1/0429/3695/9139/files/48871987549.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3133/files/10267566485.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/48392996889.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/nedeberana.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/sefexuwefoteb.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/kunujewilexuxakotodu.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_off00006bf9.bin
96685d388e3f34ea6fc5b7f6652e6646b48882dd42d7c91e81ea8e3b7acac171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF9 5044 bytes
font_01_sfnt_off00007d3d.bin
77c83c0555a5c46d26a3f9e2709d0504d0ad6d4a13c2017dd771b1b108f18f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3D 10408 bytes
font_02_sfnt_off0000a0c2.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0C2 4324 bytes

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