Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9bb16f3c810915…

MALICIOUS

PDF

45.3 KB Created: 2020-08-31 21:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11827a4572990c9db8df43db8f4fc56f SHA-1: 42ffa2c4b5ee77d10fcbd451e26c04c35dce68d3 SHA-256: 9a9bb16f3c8109158c6bacce3d136afcdd3a1088aaa5363d130089b22b7664cf
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious and contains a large number of external links, many pointing to a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=newspaper+report+writing+pdf'. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted PDF links, suggesting a coordinated effort to distribute malicious content.

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=newspaper+report+writing+pdf
    • https://cdn.shopify.com/s/files/1/0439/3094/3643/files/vufexilifozeluburuliwemiv.pdf
    • https://cdn.shopify.com/s/files/1/0438/9509/5464/files/lunosovivuzeziruwak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84593422723.pdf
    • https://cdn.shopify.com/s/files/1/0429/6815/4278/files/22203673013.pdf
    • https://cdn.shopify.com/s/files/1/0438/1691/1010/files/gigabyte_sata2_driver.pdf
    • https://cdn.shopify.com/s/files/1/0439/4385/4235/files/key_to_pem.pdf
    • https://cdn.shopify.com/s/files/1/0434/2729/9478/files/dipalarazez.pdf
    • https://static.usrfiles.com/ugd/a107db_e5dfc34481a644909a3591a15522cb2d.pdf
    • https://static.usrfiles.com/ugd/12f4eb_83f04254f3b34738a023cc1c140428e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0445731655846e8bab94c08dcb1919c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3350e7732eff4e7ebd18d9e202cbc4ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb5827ff099f4b069bf1397fac961bc2.pdf
    • https://static.usrfiles.com/ugd/b9801a_9782c9e3c4b5447eb5af48b20e8856a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_acc9de464a35427b99cb71e95afca048.pdf
    • https://static.usrfiles.com/ugd/21e6f2_8dd856fee9694f9aafe7e200318074e4.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_off00007329.bin
e6103bb2fd064ab4ec3a41da20cede0da445331d046e7833eb31a4ea0df4062b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7329 5240 bytes
font_01_sfnt_off00008523.bin
be4e64b4f96dac5690e160d66ceb0ac89ba29476bf8a11a811c8a7229d7cf225
pdf-font-stream PDF embedded font (sfnt) at offset 0x8523 10304 bytes