Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b47f093524a4f70…

MALICIOUS

PDF

46.0 KB Created: 2020-08-31 14:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f13f1749eaea004cac17a94685079dd3 SHA-1: b18ecf1c7de7ccc93e3e6cf63a3c2ceb92edb5a2 SHA-256: 5b47f093524a4f70bc07d9f66f48926f652a98b19e1b68be1f7efb965b998b37
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains text that appears to be a formblatt, suggesting a lure. The presence of numerous Shopify links, while mostly benign, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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=baf%25C3%25B6g+berlin+formblatt+2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3384/5150/files/2655609215.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7863/files/degomajatizu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0058/files/excel_vba_complete_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/16856943055.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/93900068604.pdf
    • https://cdn.shopify.com/s/files/1/0434/5466/0758/files/15162851450.pdf
    • https://cdn.shopify.com/s/files/1/0438/4486/2114/files/list_of_formulas_in_strength_of_materials.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6532/files/pembina_cardium_formation.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/44322343503.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5831/files/brisingr_christopher_paolini_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/4767/3253/files/duxufizosabutibivojabuwew.pdf
    • https://static.usrfiles.com/ugd/b8c837_51cdce691b974b5bbe43889054a00054.pdf
    • https://static.usrfiles.com/ugd/599026_2d7f3559a1684f96b2f75a44584947e5.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_off0000726d.bin
3e7e160dc879ca1b6ac8f20b1f664b72e265d1106bdbadeac4789d80e0adfe26
pdf-font-stream PDF embedded font (sfnt) at offset 0x726D 5368 bytes
font_01_sfnt_off00008466.bin
891088f9c0d547bb7777d0b52d5934d8c8ab24d06dc01746bb2ef6fc66aa5bbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x8466 11352 bytes