Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a73a5606a3e532…

MALICIOUS

PDF

33.2 KB Created: 2020-08-26 03:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a29d846d679ee6a5b909a0d85df7839 SHA-1: 23792ec55177cf0398683fb7b9b8b020ef2f899c SHA-256: 80a73a5606a3e532d1b31c2f5ad1e01f73a24a17a45702548b526e6c799f9606
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, contains the same search query as the redirector URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector indicates an attempt to lead the user to a malicious site.

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=como+convertir+coordenadas+geograficas+a+utm+manualmente
    • http://files.themastectomystore.com.au/uploads/1/3/1/8/131871952/moforakig.pdf
    • http://files.neywe.org/uploads/1/3/0/7/130776590/5700376.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/candlestick_chart_patterns_for_day_trading.pdf
    • https://cdn.shopify.com/s/files/1/0432/3590/1602/files/jisedeximoxoxanogarobo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2679/2093/files/dusumesezawegupifod.pdf
    • https://cdn.shopify.com/s/files/1/0437/1211/8952/files/masha_babko_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/papillon_jack_russell_terrier_mix.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7746/files/verifone_vx_520_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/9691/4600/files/adp_ipay_app.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5006/files/18228267937.pdf
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/96907821914.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_off00004172.bin
b37378d72124a8fabdeaf52be1727056aa313774d4990c7326fe89038709762e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4172 5304 bytes
font_01_sfnt_off00005362.bin
b882778833a631ee3ab2f46175e072c2abd3c4ea73e6ce79194b67ee1cb344f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5362 10540 bytes