Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b958d8a03056046…

MALICIOUS

PDF

43.8 KB Created: 2020-07-27 19:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b52b4edb002388eb9fe4ffb28ea0a118 SHA-1: 8937f9cec09ca1ac90e3acc8ef4ae96ca271d622 SHA-256: 0b958d8a0305604678441ad6dd57b47e887232d09985ce23d7f6c112a9163be6
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, which is part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, appears to reference a game hack, suggesting a lure to entice users to click the malicious link. The presence of multiple external PDF links further supports the link farm heuristic.

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.cc/pify?keyword=asphalt+8+hack+mod+apk
    • http://files.afterpicu.com/uploads/1/3/0/9/130969494/8962040.pdf
    • http://files.thentls.com/uploads/1/3/1/8/131856191/4003b708dc53a27.pdf
    • http://files.rebeccaputman.com/uploads/1/3/1/4/131406780/kabixo-kisutinudi-xunam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/5841866615.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/fexodutaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2979/8807/files/salujupokuvototokowububoz.pdf
    • https://cdn.shopify.com/s/files/1/0439/6944/6046/files/23272257438.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5265/files/gaxaritedaronaguvelugofit.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/debak.pdf
    • https://cdn.shopify.com/s/files/1/0435/3907/1125/files/morutirek.pdf
    • https://cdn.shopify.com/s/files/1/0427/4018/7303/files/60613895912.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7427/files/43859692726.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/melolugoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/24947390146.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_off00006f13.bin
485b81fd9c5b3c9f46e2a6b4b372176a5f0e9a6606d143832ddf87404e3a2441		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F13 4980 bytes
font_01_sfnt_off00007ff6.bin
6d2443dacafcce5b2d04c2919bd481f839b0bf5262e05eccd5284033085c4f9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF6 10100 bytes

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