Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7da0f3b5649132…

MALICIOUS

PDF

41.0 KB Created: 2020-08-25 00:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd119170dcc5cbf65e428184f434e6fc SHA-1: e83351a2cb8424fcc070ad7d7c8098a7bcaf0939 SHA-256: 6a7da0f3b564913225349e613b5ce1b29ed121c1bbc631d8525268451a50c7d5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including one pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=transformer+primary+amps+calculator'. The document body, though heavily obfuscated, contains references to URLs and appears to be a lure for a calculator, suggesting a phishing or malware distribution attempt. The ML classifier also 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.ru/pify?keyword=transformer+primary+amps+calculator
    • http://vabuzas.pkpowders.com/uploads/1/3/1/8/131856372/fubevagavefil_goruduxibagu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/82143823335.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4496/files/dedixewanavopebinujow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6594/1917/files/62234464359.pdf
    • https://cdn.shopify.com/s/files/1/0431/3559/8758/files/sanuvuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/79381321339.pdf
    • https://cdn.shopify.com/s/files/1/0432/3396/8287/files/skf_ball_bearing_catalog_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/55469748960.pdf
    • https://cdn.shopify.com/s/files/1/0440/3966/7877/files/94539152869.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5986/files/toro_521_snowblower.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6076/files/97741036989.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_off00005cdb.bin
d14dbef620b68d9b0ed0575ecc1e217c5a0bc565303fd1380a30b606199d897d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDB 5212 bytes
font_01_sfnt_off00006e84.bin
c894e8eadf40ae51cf050560f0574fda12aa2f5841bb3ed65b2b406fe784c09d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E84 12968 bytes