Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8487145077ef102…

MALICIOUS

PDF

47.6 KB Created: 2020-08-07 20:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6f5da428264dcf4718364ca07859135 SHA-1: bbdfdbc5f20c84a4df6ea90250654a8171cf0244 SHA-256: a8487145077ef102f0a380524e32c50fd473a31e5c76847b91b003f75108ba02
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=add+comment+adobe+pdf'. This URL is presented within the document body, disguised as a way to add comments to a PDF. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=add+comment+adobe+pdf
    • http://files.bwitched.com.au/uploads/1/3/2/6/132682822/sefudujof-rorogojitaf-rorepe.pdf
    • http://files.tangobug.com/uploads/1/3/1/3/131382531/6d2608.pdf
    • http://files.rvrescueart.com/uploads/1/3/0/7/130775668/tadol_togeb_jukibezutabaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8848/files/98634203713.pdf
    • https://cdn.shopify.com/s/files/1/0429/3217/5014/files/rederevumefizu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4364/2773/files/92078930861.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/resource_packs_1._7_10.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3876/files/94918292378.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/atomised_michel_houellebecq.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdf
    • https://cdn.shopify.com/s/files/1/0430/1937/0659/files/59441899698.pdf
    • https://cdn.shopify.com/s/files/1/0437/9538/2429/files/lightroom_cc_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0434/5721/6678/files/rumoxifupo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/bakalsk_prce_uhk.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/98602727510.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d19.bin
a6b91541373b7a968e2597b08ddcc4ec01487961ef7c1834ec088ee3f79c2618
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D19 5124 bytes
font_01_sfnt_off00008e75.bin
c7b98e7bffb700b4f3fa5e0afc6aad1592c97a7faada822310cf775248a3d2c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E75 10304 bytes