Malicious PDF — malware analysis report

Static analysis result for SHA-256 0292d5174d660ecf…

MALICIOUS

PDF

39.8 KB Created: 2020-08-21 13:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 807f60dab5b57de5e4c8183cf6c4941a SHA-1: 2e721d09ffbd6725f6d66c805341dca52af1764e SHA-256: 0292d5174d660ecf22fa29cb10267e84782b3ce7d9c7d653ad8346d5efca4ab0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains text related to 'corrugated steel sheets uk' and the malicious URL, suggesting a lure to a phishing or scam page. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=corrugated+steel+sheets+uk
    • http://wirelow.carolarnott.com/uploads/1/3/1/8/131858540/kisokixu-zalosa-gaziviz-xutiraxozapuxi.pdf
    • http://files.ekohaus.lt/uploads/1/3/0/7/130775462/1299834.pdf
    • http://files.stemgage.com/uploads/1/3/1/3/131380177/kusegap-febisixejok-sizejabunanus-debapesizox.pdf
    • http://files.thomasjamesolearydirector.com/uploads/1/3/1/3/131380495/1649061.pdf
    • http://files.hamptoncommunitykinder.org.au/uploads/1/3/1/4/131406892/mezufipagosem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0265/0011/files/blood_test_report_for_fever.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/91443584352.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/85147506392.pdf
    • https://cdn.shopify.com/s/files/1/0434/5738/0514/files/7397024194.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/10575166644.pdf
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/31058157847.pdf
    • https://cdn.shopify.com/s/files/1/0433/2742/2632/files/zasoxipumizarili.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/77108191234.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_off00005e16.bin
d0ffc438110b11b4df978709e5daa13f9ca81b13d1f4c8c6d5270cfae4ebe08f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E16 5056 bytes
font_01_sfnt_off00006f3c.bin
31e1e6e5aee5ee55ec38a73d6290b678d30d5744e717082de6c1129e71c0f018
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3C 10352 bytes