Malicious PDF — malware analysis report

Static analysis result for SHA-256 06cfc44c578402e2…

MALICIOUS

PDF

40.2 KB Created: 2020-08-16 22:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a711e999bb58d1473f120fe8090a624 SHA-1: d2ab054f481b93a2eae097fca781067cf9443398 SHA-256: 06cfc44c578402e2e75f43fd40e27a4a92dfc869a6ea666a5158c27a0d34a2f7
174 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with text referencing a jail report. It also hosts a large number of other PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs indicates an attempt to direct users to malicious content.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=cerro+gordo+sheriff+jail+report
    • http://files.routestowork.co.uk/uploads/1/3/1/4/131455903/2397246.pdf
    • http://files.theangeltech.com/uploads/1/3/0/7/130739906/tabipesuzazowiv.pdf
    • http://files.woodhullgenealogy.com/uploads/1/3/0/8/130874416/zojevakovalazu_tigetaz_gibatanuse_tolajitejeku.pdf
    • http://files.oak-steakhouse.com/uploads/1/3/2/6/132682882/sidigasodupuko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/8127/4278/files/silent_night_movie_2002.pdf
    • https://cdn.shopify.com/s/files/1/0438/1874/6013/files/kowejakuzokipuluvafaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6165/files/carburizing_heat_treatment_process.pdf
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/human_lyrics_christina_perri.pdf
    • https://cdn.shopify.com/s/files/1/0431/1757/6354/files/hernia_hiatal.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/dopomifired.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3866/files/40506852405.pdf
    • https://cdn.shopify.com/s/files/1/0433/4934/4421/files/que_es_el_microscopio_optico.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/14480560821.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_off00006063.bin
c1406616e2b84272217a7fb85da9babad54cafbb96db2888f331a9b011eff220		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6063 5284 bytes
font_01_sfnt_off00007263.bin
dfba50a0c7583acc95454832aa3a009c64a26de0357c228253393ef678f0e794		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7263 9864 bytes

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