Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c8130f21e6f14f…

MALICIOUS

PDF

38.9 KB Created: 2020-08-31 19:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c93194a781722620a6eebc948c942253 SHA-1: 54b4686fe3b7c4f8d894de10f3ed5d1c85046c9f SHA-256: 53c8130f21e6f14f8adf495cba33435613a7edbe634703491eaa43ec4478de9c
152 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=excel+data+entry+form+template', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a template for Excel data entry, likely a lure. The presence of numerous other links to Shopify PDFs, combined with the malicious redirector, indicates a link farm or SEO poisoning attack designed to drive traffic to malicious sites.

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/wix?keyword=excel+data+entry+form+template
    • https://cdn.shopify.com/s/files/1/0431/3631/9645/files/60223067420.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/84708610822.pdf
    • https://cdn.shopify.com/s/files/1/0434/1291/4332/files/free_ppt_templates_education_theme.pdf
    • https://cdn.shopify.com/s/files/1/0462/6707/2669/files/tubifovizoxekanojuzuporit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/35744657565.pdf
    • https://cdn.shopify.com/s/files/1/0434/2572/6625/files/funixomizoxatenisotu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/asia_map_file.pdf
    • https://cdn.shopify.com/s/files/1/0434/0714/7166/files/74299534383.pdf
    • https://cdn.shopify.com/s/files/1/0431/1865/7697/files/torch_browser_apk_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0434/1917/3029/files/ansel_adams_biography.pdf
    • https://cdn.shopify.com/s/files/1/0468/0073/2311/files/xidowipujitexejewuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/1031/6694/files/real_estate_australia_forms.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1391/files/saziwepagow.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/bujefuvadasimizoran.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_off00005b2c.bin
9bdb12249c3706af663e5d295b7e0c967f22fc35dff7ca289de574490a1da15e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2C 5252 bytes
font_01_sfnt_off00006d05.bin
96cdab8ee1112b9cd42aba53d227899270bf0ad1d23db248f3b4f9771a2e6eff
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D05 9932 bytes