Malicious PDF — malware analysis report

Static analysis result for SHA-256 6393c17efa7d3884…

MALICIOUS

PDF

50.3 KB Created: 2020-08-13 11:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c23887f879e56325543bcb931c36ac1 SHA-1: 3b4df2036bd75f59a1955093923f2f68bfb20eac SHA-256: 6393c17efa7d38840cef9ec8e48c09ad32bbed6d8ee7abba444ec43a42fca3a8
174 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirectors or SEO link farms. The document body includes a URL that leads to a redirector, suggesting an attempt to lure users to malicious infrastructure under the guise of a free download. The ML classifier also strongly indicated maliciousness.

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.ru/wb?keyword=fast%20fourier%20transform%20pdf%20free%20download
    • http://files.southernsisbowtique.com/uploads/1/3/1/3/131380480/d4c6c2834a9a7.pdf
    • http://wupofi.ladavisbooksllc.com/uploads/1/3/0/8/130813509/81c40874b.pdf
    • http://files.milestoneshomeinspections.net/uploads/1/3/0/8/130874474/5621387.pdf
    • http://files.cherylannhillsartist.com/uploads/1/3/1/4/131409090/kikoxupufa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9041/0658/files/zixiwo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6578/3958/files/goodwill_valuation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/56035130853.pdf
    • https://cdn.shopify.com/s/files/1/0439/1885/2264/files/accounting_standard_14.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wugituvunajobi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0898/2165/files/didevenobagelixuzirezore.pdf
    • https://cdn.shopify.com/s/files/1/0428/9065/7951/files/45204643859.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6091/files/29556809553.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9909/files/cattell_theory_of_personality.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/oxford_phonics_world_vk.pdf
    • https://cdn.shopify.com/s/files/1/0430/2775/9257/files/pulewuxozujonazag.pdf
    • https://cdn.shopify.com/s/files/1/0431/7570/6788/files/59616176451.pdf
    • https://cdn.shopify.com/s/files/1/0433/9410/5509/files/dimob.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_off00008733.bin
d0a7896dccf7d702716b97bc56b95a35d4b1e6cf85ff5437535bc8748506b503		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8733 5232 bytes
font_01_sfnt_off000098ff.bin
128d527cfdb1ab698f637e18934fcc6dfe0ed13b0e70b5b3f78d389d1a90ef48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98FF 10424 bytes

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