Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c73e00f70863c5…

MALICIOUS

PDF

46.8 KB Created: 2020-08-14 23:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c99cfa7910e9a56977ca1ab56c894212 SHA-1: 5400bc229756797e31a66a910ff1e9e083696f9c SHA-256: 61c73e00f70863c5ba879a27f4ed828f7a9ba4b5cab7f38c900c3386b4476967
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links, https://ttraff.ru/pify?keyword=chopsticks+music+sheet, points to known malicious redirector infrastructure. The presence of 30 PDF links suggests a link farm or SEO spam campaign, designed to drive traffic to potentially malicious sites.

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.ru/pify?keyword=chopsticks+music+sheet
    • http://files.spiritofgoldenjoinery.com/uploads/1/3/1/4/131406356/5753158.pdf
    • http://files.itshoursunlimited.com/uploads/1/3/1/4/131437689/pojobabofa-gojadatorix-kufevalotofot-patuvu.pdf
    • http://bipogowa.materchristireligioused.com/uploads/1/3/0/8/130874197/7075883.pdf
    • http://zisulana.activemkfitness.com/uploads/1/3/1/8/131857631/kegipubixi-vitelupileger.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/4256/9368/files/lapeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/2039/3375/files/3546054598.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/fezafimad.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/chemistry_8th_edition_zumdahl.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/18607995222.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5345/files/bonafide_certificate_institute_verification_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/1688/0281/files/93809089395.pdf
    • https://cdn.shopify.com/s/files/1/0447/9208/6685/files/branches_of_government_project.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9030/files/dr_berg_liver_body_type.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/jubixedebimotena.pdf
    • https://cdn.shopify.com/s/files/1/0439/1141/3915/files/86748864109.pdf
    • https://cdn.shopify.com/s/files/1/0438/5207/1074/files/98901322675.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_off00006c67.bin
db59f4d60fd29cf58fb3676619bc6fbab53ea717e7ec72fa325c0e2801193ae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C67 4700 bytes
font_01_sfnt_off00007c74.bin
9f05169bc388cc387a3093a7bc3b1d18756255357f0ed5800fed450f468f8701		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C74 10488 bytes
font_02_sfnt_off0000a043.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA043 4324 bytes

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