Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9b613d9b30ea51…

MALICIOUS

PDF

50.0 KB Created: 2020-07-27 16:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad84fe35e4861aa67ff636658e7a5e87 SHA-1: a36be8e3cbd89b1d1a40d86cb0378d6fae504dda SHA-256: 6a9b613d9b30ea51eb0d43b7799b12c20662b24d4f70158b2e469fc9a4e04174
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to be junk data, suggesting the primary malicious function is the embedded links, likely for SEO spam or phishing.

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.ru/pify?keyword=shape+of+molecules+worksheet
    • http://files.creameryartscenter.org/uploads/1/3/2/7/132740628/982905c820b0d93.pdf
    • http://files.themastectomystore.com/uploads/1/3/1/3/131397996/9353995.pdf
    • http://files.afitconcepts.com/uploads/1/3/1/4/131408103/vixirolik.pdf
    • http://files.mexicolegalhelp.com/uploads/1/3/2/6/132682134/timulapafaji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/70490645197.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/gebixozalutuzewelu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/jojarap.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/63192582128.pdf
    • https://cdn.shopify.com/s/files/1/0433/7926/1590/files/69405472189.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/22640739107.pdf
    • https://cdn.shopify.com/s/files/1/0431/0728/7189/files/52782298913.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/79265304831.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/38434486693.pdf
    • https://cdn.shopify.com/s/files/1/0436/1538/7811/files/32559164103.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/fejonomezixatezafefuvim.pdf
    • https://cdn.shopify.com/s/files/1/0439/2891/2040/files/74206192843.pdf
    • https://cdn.shopify.com/s/files/1/0434/6668/6617/files/2658224490.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2645/files/jokubuvamilet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3530/3831/files/namivijakezeku.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_off00008694.bin
49c1faef7a8d382a886c71c3344b4a92ee06c651e1dc02deecf83148dbcd4377		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8694 5244 bytes
font_01_sfnt_off00009880.bin
1b9c144141e4fac7b3d97dc5ccf051c34884e2c23b378ee56e99a787360f1203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9880 10004 bytes

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