Malicious PDF — malware analysis report

Static analysis result for SHA-256 495245fd038d33d1…

MALICIOUS

PDF

33.8 KB Created: 2020-08-19 05:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 156cb9228fdc70a58d1583ca339f2c8e SHA-1: f4340aa37cbc08cbc1b32ce97bf92faf34230a9d SHA-256: 495245fd038d33d144d5a3ce2084253d90d037af086c32bd26ee069fd7d7615c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that redirect to a known malicious URL, ttraff.com, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'binomial probability worksheets' and the malicious URL, suggesting a lure to entice users to click the malicious link. The presence of numerous external PDF links, many pointing to benign Shopify URLs but some to unknown domains, further supports the link farm heuristic, indicating an attempt to manipulate search engine results or distribute content through a variety of means.

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=binomial+probability+worksheets
    • http://roputaxu.appledoreantiques.co.uk/uploads/1/3/1/3/131379730/e7264.pdf
    • http://files.connierhae.com/uploads/1/3/0/7/130775828/c79e9444c7.pdf
    • http://files.gardenspotrentals.net/uploads/1/3/2/6/132681938/finefenusavat.pdf
    • https://cdn.shopify.com/s/files/1/0432/8092/4837/files/organizational_chart_template_for_powerpoint_2010.pdf
    • https://cdn.shopify.com/s/files/1/0433/7798/3653/files/23975647864.pdf
    • https://cdn.shopify.com/s/files/1/0428/9688/3868/files/71833998015.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3950/files/accounting_ledger_templates.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/buku_marketing_public_relations.pdf
    • https://cdn.shopify.com/s/files/1/0454/5989/8518/files/74452705283.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/basic_spanish_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/93344049882.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_off000047b9.bin
cd611850ca89fb4adfb4072ee19aa18a730d91c629089f544227f5564ee25260
pdf-font-stream PDF embedded font (sfnt) at offset 0x47B9 5504 bytes
font_01_sfnt_off00005a4e.bin
50e720164297f96e61dd624c297b9c9b3e73160e063f9910d46958fe05f9b80d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4E 9524 bytes