Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52c2bc6877ffbae…

MALICIOUS

PDF

37.1 KB Created: 2020-08-30 18:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9ad4469bdc1dafec1a044e894be3b5e SHA-1: 133c1d05ec66623ebad58dfc8d07055a15b7af58 SHA-256: a52c2bc6877ffbae22fa6f4e3736ec44f3758f55b7bc144cf612dc29583a106f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=p+to+jk+scan+vf'. This URL is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. The presence of numerous other PDF links, while some are benign, suggests a link farm strategy to obscure the malicious destination.

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/wix?keyword=p+to+jk+scan+vf
    • https://static.usrfiles.com/ugd/b8c837_b666f057f9024753a974a981014e7577.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed20c1791e7246ed816be19494ce6b07.pdf
    • https://static.usrfiles.com/ugd/8ab72e_7cfa31acdc524269889a755c849f0e8d.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8805/files/nelulosajer.pdf
    • https://cdn.shopify.com/s/files/1/0431/0958/0967/files/83746057271.pdf
    • https://cdn.shopify.com/s/files/1/0463/4856/6690/files/chicco_next_to_me_magic_crib_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/4092/3048/files/43498805546.pdf
    • https://static.usrfiles.com/ugd/fb5067_86b49cc23dac4adf9ef95e2daa2f672a.pdf
    • https://static.usrfiles.com/ugd/0d9a50_c467a124396f40f5a946fc0f07f1c9a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_019bf0379c7b4e1faca1db5e2cfd3c5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bcc0007b4d3b41fcb9e33fc4eecbbc11.pdf
    • https://static.usrfiles.com/ugd/6da380_d52598852f4f47d7a85a581cfe8f5f68.pdf
    • https://static.usrfiles.com/ugd/b5aed9_4837594331e04cf39e8ba9aa6f47e739.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000458e.bin
b4e81babe705b0e72537222b7357f629541ae8586c155683c6d9d1cc1aff5fcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x458E 4356 bytes
font_01_sfnt_off000054f8.bin
4160e05106562301242ad3e3a03d1d5b0973a298c18148c5a8d50514fe043f39
pdf-font-stream PDF embedded font (sfnt) at offset 0x54F8 4948 bytes
font_02_sfnt_off000065f7.bin
228b730fedc47a7f97d1827be0aa43697b219f6e942ec4dc0fd505b10624504c
pdf-font-stream PDF embedded font (sfnt) at offset 0x65F7 9868 bytes