Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cb6ffb8d6dbd06…

MALICIOUS

PDF

47.3 KB Created: 2020-09-18 08:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16abb9e709b51bbafda18a5880305b15 SHA-1: 9c31d633d29f64ae917074b248f3df93f61e0991 SHA-256: 92cb6ffb8d6dbd06843f97c4894248c4387b51aad873fd992a2bfff76c96b0db
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, forming a link farm. One of these links, 'https://ttraff.me/wix?keyword=nesco+18+quart+roaster+oven+owner%2527s+manual', is flagged as a malicious redirector. The presence of a link farm and a malicious redirector strongly suggests a phishing or malware distribution attempt. No scripts were extracted, and the document body is heavily obfuscated, but the link farm is sufficient evidence for the attack pattern.

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.me/wix?keyword=nesco+18+quart+roaster+oven+owner%2527s+manual
    • https://70d2269e-a983-4b16-a0df-fb515812dd1b.filesusr.com/ugd/97634b_dab7e091d6734f719b06539514e37f99.pdf?index=true
    • https://2e6e18de-25d4-4502-abae-4a2527520e33.filesusr.com/ugd/61c57f_7e55197a583546b5bda9e694c6228ba5.pdf?index=true
    • https://bfd79b76-4914-422a-9d04-c41122255e91.filesusr.com/ugd/9b7d8a_1de04b369dd94d3eab3e8e49ec8caf8e.pdf?index=true
    • https://d488eb2b-f3c2-4695-87fd-5d414ec33efd.filesusr.com/ugd/54bec1_875186b0ecd34c4c9faeb176f02cc50d.pdf?index=true
    • https://1ce6e588-973a-4439-916f-4d259254c675.filesusr.com/ugd/3c9ac1_53d6580c33ce4894888aa057bb36689f.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojedeteremedadedarovir.pdf
    • https://cdn.shopify.com/s/files/1/0428/6794/9724/files/8076239286.pdf
    • https://cdn.shopify.com/s/files/1/0432/1558/5448/files/39535201409.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4594/files/rexezisovilewus.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/leboteretivofibemex.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/clasificaciones_del_derecho_penal.pdf
    • https://cdn.shopify.com/s/files/1/0434/2526/7877/files/beethoven_silence_piano.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c8e.bin
988dce94a4ed15294a779449be2e865119631158998c638bea634cc4907e4943
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8E 5472 bytes
font_01_sfnt_off00007f45.bin
30b56126b0b43acb5961f474e308e4b8c64870e81ada743761ffbcc722f76fa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F45 15208 bytes