Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a337eff5557e42…

MALICIOUS

PDF

36.2 KB Created: 2020-08-14 01:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6066fd8921d91aed366391aeb522a4f1 SHA-1: bbe61af8f596134b52e53832dc7e133911723d8c SHA-256: 68a337eff5557e42712148acd22bc1017961c59f4802000e93bd90f6eaf426d4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains URLs that suggest a lure for free PDF downloads, likely to drive traffic to malicious sites or engage in SEO spam. The ML classifier strongly indicates malicious intent.

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=argala+stotram+in+telugu+pdf+free
    • http://dakevejob.gotministries.org/uploads/1/3/1/3/131380600/mokitez_dasilufoba_dagivigijere_jipajamo.pdf
    • http://files.aklkansas.com/uploads/1/3/1/4/131437045/tonigotuteb_vepizejixaxonal.pdf
    • http://files.linhr.com/uploads/1/3/1/0/131070189/tabotusatoboza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3575/4650/files/52111910023.pdf
    • https://cdn.shopify.com/s/files/1/0438/6874/9979/files/98396883882.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4250/files/76040679939.pdf
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/43740362720.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2043/files/outlook_images_automatically.pdf
    • https://cdn.shopify.com/s/files/1/0436/7086/4025/files/71822456922.pdf
    • https://cdn.shopify.com/s/files/1/0434/3837/5074/files/jilatexagex.pdf
    • https://cdn.shopify.com/s/files/1/0432/5248/2208/files/29380520221.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0296/files/burger_king_gutscheine_juli.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_off000049b2.bin
e938babb915e2ede271616dcea006f69f6bbf166bb87435108f02a259cc496b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x49B2 5348 bytes
font_01_sfnt_off00005bc7.bin
604dd943055856775fbf5fad59947cbbeafcaa07e7b8d6c49d5a8a83ab0fbdcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC7 13528 bytes