Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b99026e3724500…

MALICIOUS

PDF

47.2 KB Created: 2020-08-06 10:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e36ad2efdccc5ffdee2b61af1025e30 SHA-1: 95e4f6f38bd3134483868bd32f758384c217edb9 SHA-256: 88b99026e372450035acc37cbaa682a3904080e85218e769c0f128951a290bbd
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for distributing malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to improve SEO for malicious content. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall heuristic firings point towards a phishing or redirection attack.

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=electrical+engineering+basics+question+and+answers+pdf
    • http://wotogaxan.medpixel.net/uploads/1/3/2/6/132681670/f05c23.pdf
    • http://files.trancityevent.com/uploads/1/3/1/4/131483267/zamuvemadabov.pdf
    • http://files.natureofchemistry.com/uploads/1/3/0/8/130874110/a036745.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/6406/5174/files/78640374776.pdf
    • https://cdn.shopify.com/s/files/1/0428/7725/5836/files/70902248274.pdf
    • https://cdn.shopify.com/s/files/1/0430/9955/3959/files/59668868598.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/75030404564.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/lukokugatukekuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3383/files/61614692421.pdf
    • https://cdn.shopify.com/s/files/1/0433/8892/8150/files/xitavirekixujolodujijoro.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/gufok.pdf
    • https://cdn.shopify.com/s/files/1/0429/8830/6586/files/jumitotedir.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/basketball_tryout_evaluation_form.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_off000068ef.bin
d31c7260fba49246d8949cb359a372b1a5a418a3b6f0032f5351d575ef494fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EF 5520 bytes
font_01_sfnt_off00007bbb.bin
7071682cb746b0d4dbc98f560a2154608dec7f740b2bd140e0c2e722c475ce5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBB 11112 bytes
font_02_sfnt_off0000a171.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xA171 4324 bytes