Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c64692e008ac838…

MALICIOUS

PDF

44.9 KB Created: 2020-08-04 22:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5082f11a29c9ab67cd2b07f50e302422 SHA-1: 0207a3e21267c4e7a4d03316eb576002ece0e04f SHA-256: 5c64692e008ac83888f5f948f75aa2cea1df2006d7bdc176eb29cd1708d23991
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to SEO-optimized PDF farms, and one specifically to a known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness. The presence of embedded JavaScript, though not fully detailed, suggests the potential for further malicious actions like downloading and executing additional payloads.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=database+administration+and+management+pdf
    • http://files.bobgraysonart.com/uploads/1/3/1/4/131407547/worixakuwinoxuzug.pdf
    • http://files.swmichiganbuttery.com/uploads/1/3/0/8/130874489/3006375.pdf
    • http://wubomom.microedmspecializedproductionmachines.com/uploads/1/3/2/7/132741334/kizivegalajumifelul.pdf
    • http://files.rosewoodandyork.com/uploads/1/3/1/3/131398097/xebimewakabafamono.pdf
    • http://files.lobolab.org/uploads/1/3/2/6/132681342/7057054.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/gajokolago.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/break_even_analysis_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/6618/7176/files/yamaha_ttr_125_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/motezosilofe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5317/files/60090453087.pdf
    • https://cdn.shopify.com/s/files/1/0434/2530/0629/files/2018_camry_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/borifaxuve.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tomazemajetel.pdf
    • https://cdn.shopify.com/s/files/1/0431/4936/1314/files/sewugomojegawun.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_off000070f9.bin
8fe9664a5a4dfdbe8317412848a25dc358d2aab6eaa145bf8d49495a8b2bbfa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F9 5468 bytes
font_01_sfnt_off00008376.bin
cab53de39fd93be39ef8456d03f53f673ecb88fc7b8cddbd4deb1f7cba1b0a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8376 10304 bytes

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