Malicious PDF — malware analysis report

Static analysis result for SHA-256 722d9cf032a7d58e…

MALICIOUS

PDF

41.5 KB Created: 2020-08-28 12:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 750986b36edb14ed2321cb2fbffc8fd5 SHA-1: 6216c040a963be92e834064809ef2c319e37d002 SHA-256: 722d9cf032a7d58ec6628e2cf4fd8e8a93245567d0b91ede497a76be36fbc7f8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Aashto bridge design specifications' and a URL that mirrors this, suggesting a lure. The ML classifier strongly indicates maliciousness, and the presence of multiple external links points towards a link farm or phishing attempt.

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.me/pify?keyword=aashto+bridge+design+specifications
    • http://zoraw.lilscholarspreschool.com/uploads/1/3/2/6/132681477/ed2395a5c1fee.pdf
    • http://lerum.novelideaspublishing.net/uploads/1/3/1/8/131871864/ece5b98d.pdf
    • http://files.carolgalais.com/uploads/1/3/2/7/132740747/dagutu.pdf
    • http://files.abbyloupottery.com/uploads/1/3/0/7/130740517/rekeroxelomalak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/3738/2040/files/kiwuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8180/files/guitar_caged_system_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/4823/8236/files/tratamiento_de_disenteria_amebiana.pdf
    • https://cdn.shopify.com/s/files/1/0434/4535/4658/files/warhammer_adeptus_mechanicus_codex.pdf
    • https://cdn.shopify.com/s/files/1/0462/7031/6693/files/ruwagurasudufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7982/files/38808253525.pdf
    • https://cdn.shopify.com/s/files/1/0430/9093/5969/files/gotuxetulisupimepipobapu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/jutatawizoxumevoti.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/joxoxonurojijataniwigob.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3074/files/genofasinivukune.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e0.bin
d2d60371f699c86d2dcaad81aaa750878da5361ee817ecef032fb5b4bb026432
pdf-font-stream PDF embedded font (sfnt) at offset 0x63E0 5516 bytes
font_01_sfnt_off00007692.bin
1d9748254911e267bbd872261a5dfdf02f9ae8f31158eca25e115cff6273a6d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7692 10040 bytes