Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd45b7f87ae0cb9…

MALICIOUS

PDF

45.8 KB Created: 2020-08-11 23:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a36fa7a00bc15b146c30c1357ee5575c SHA-1: 59256742d8f44ec7280370b2dda7513576af1e3f SHA-256: 7bd45b7f87ae0cb9d06990c639e06edac2c4e8025aefb654c9325fce60d9ad38
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link to a redirector, ttraff.cc, which is flagged as malicious. It also hosts a large number of external PDF links, many pointing to Shopify, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains the text 'Job interview tips pdf' and the malicious URL, indicating a lure to trick users into clicking the 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.cc/pify?keyword=job+interview+tips+pdf
    • http://files.key2evolve.com/uploads/1/3/0/8/130874318/zasabuxemer_xawapikiguromik_balasoge.pdf
    • http://files.cooliecollection.com/uploads/1/3/2/6/132695432/3722858.pdf
    • http://files.oswegoeasthighschoolbands.com/uploads/1/3/1/4/131438418/6551688.pdf
    • http://files.mountainspiritswellness.com/uploads/1/3/1/0/131069906/sozakukowux-kinotowikik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0899/1125/files/31886530001.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/45821373545.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8673/files/bizoni.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0796/files/69238837126.pdf
    • https://cdn.shopify.com/s/files/1/0431/1629/8393/files/wezegusinizuxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/441986331.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/48833252569.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/3779855100.pdf
    • https://cdn.shopify.com/s/files/1/0431/5945/3845/files/9mm_reloading_data_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/1816/5144/files/jeguniroporuxaguseta.pdf
    • https://cdn.shopify.com/s/files/1/0430/9067/3813/files/dunesizonevejekij.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_off000076c8.bin
e34dc5527b7b4600b61e11ef6cb51f8283362ee2efa8402f7c6e847653ada3aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x76C8 5076 bytes
font_01_sfnt_off00008824.bin
b191c09a9ccf55ed7753896967e17d8cf1252bb4711fbe7b3225a3cdabed535a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8824 9964 bytes