Malicious PDF — malware analysis report

Static analysis result for SHA-256 632b2105c79244bf…

MALICIOUS

PDF

41.9 KB Created: 2020-08-04 22:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86a3f11f24770fd543d465b912d7b288 SHA-1: 809b997c4ecfa2ea79a2a6e683eed6084c19a0ee SHA-256: 632b2105c79244bf2cd6543123db1cca7127c8e399df0b55186a851c1a6f933f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for link farms and SEO manipulation, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a PDF of 'gate verbal ability questions', likely a lure to entice users to click the malicious link. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or redirection attack.

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=gate+verbal+ability+questions+pdf
    • http://files.sparkleelearning.com/uploads/1/3/1/8/131856446/6477398.pdf
    • http://kadupezo.physedresource.com/uploads/1/3/1/4/131453902/wenufutuguno-takuzifigijig-fofodefijivi-refojava.pdf
    • http://files.viewpointvideos.com/uploads/1/3/1/6/131606256/0947b7.pdf
    • http://files.greganchauffeurtoursireland.com/uploads/1/3/1/1/131164418/5296334.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/72008738633.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6444/files/73259982416.pdf
    • https://cdn.shopify.com/s/files/1/0436/2836/3939/files/lobamikeropajefedoje.pdf
    • https://cdn.shopify.com/s/files/1/0433/9603/8812/files/zapedovenubobi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/xikuka.pdf
    • https://cdn.shopify.com/s/files/1/0428/8570/9987/files/vajutipuwib.pdf
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/14645686148.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/fra_forward_rate_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0435/3189/4944/files/17625585946.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/96522471615.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/tukividajikurekuvabefeme.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/lukomer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88406012193.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_off00006571.bin
b6bd4ce3d3235764090c0530243ab8adda82c09875784408dc7f14416675232c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6571 5492 bytes
font_01_sfnt_off00007836.bin
34f8b0ceeed9a91fafb02224309efea5173ff4a1bff906aa18ff6ca2f1e7ae87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7836 10060 bytes

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