Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8a8ba2fd38e0c0…

MALICIOUS

PDF

43.0 KB Created: 2020-08-31 04:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e57de4c9ff0f3e900bb15c99ff7988c SHA-1: 7c3dbe88fcfdeed795758a8eabfabe88ff56e94e SHA-256: 2b8a8ba2fd38e0c0552089c3cb6fa20ba4e03df182f7323630b9c234b159bb7b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a lure document disguised as a payment stub, directing users to click on a link. This link, https://ttraff.com/wix?keyword=imprimir+talon+de+pago+de+ieepo+oaxaca, is identified as a malicious redirector. The document also features a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic. No scripts were extracted, but the primary malicious action appears to be redirection via the embedded link.

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.com/wix?keyword=imprimir+talon+de+pago+de+ieepo+oaxaca
    • https://cdn.shopify.com/s/files/1/0436/8531/4715/files/storm_in_a_teacup_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1752/files/75551032145.pdf
    • https://cdn.shopify.com/s/files/1/0434/6537/5908/files/curse_of_the_wolfen.pdf
    • https://static.usrfiles.com/ugd/822ecd_072c7d4b1f3d45cf8343961560ebae8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f34342e4c6f243d98bcb688bf4e93322.pdf
    • https://static.usrfiles.com/ugd/bfbc46_356957aa3c6d4fde94c0fbd225f2ef8f.pdf
    • https://static.usrfiles.com/ugd/696b8a_d8064fc611d04ebc85857fb319b32e8d.pdf
    • https://static.usrfiles.com/ugd/2e79a6_b684803b7d884dcb88d402ea7ed60d03.pdf
    • https://static.usrfiles.com/ugd/b8c837_c51d1268b52a4ac887731ced405e97ec.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/zebalajefefuvagiwuva.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/wifafipakokovavir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/zagisalirupukutabubuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/6455/5675/files/8244948690.pdf
    • https://cdn.shopify.com/s/files/1/0463/2628/4445/files/addendum_report_format.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_off000067ce.bin
67936ca58391466e1400cb0a6bf58488f12bb9e73d246d7cc47a791be44e0d10
pdf-font-stream PDF embedded font (sfnt) at offset 0x67CE 5220 bytes
font_01_sfnt_off00007971.bin
e71dba96c791addc9c54b08fd151f91afca54718a6cca43d056789bba92fea3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7971 11116 bytes