Malicious PDF — malware analysis report

Static analysis result for SHA-256 641d5939ac92ae86…

MALICIOUS

PDF

40.6 KB Created: 2020-08-16 10:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49b1218e3593be14766df8f40f1d96d1 SHA-1: 119b458dfab10b8c4804c643181aaa45020120f8 SHA-256: 641d5939ac92ae86fe42c16802b80c36fee3b1e9f748ebbef091d1c98d73b3fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, including a critical redirector link to 'ttraff.com'. The ML classifier also strongly indicated maliciousness. The document's primary function appears to be to lure users into clicking these links, likely leading to further malicious content or phishing pages.

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=guided+imagery+and+music%2528+gim%2529
    • http://files.coupalstouganda.com/uploads/1/3/0/7/130775134/4083161.pdf
    • http://files.camdenilc.org/uploads/1/3/1/6/131636819/199a3e45658de7f.pdf
    • http://files.fresnohair.com/uploads/1/3/1/4/131452944/a9698e29d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/zelorizexorolozepufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/wojukatexav.pdf
    • https://cdn.shopify.com/s/files/1/0436/0667/1517/files/16847118247.pdf
    • https://cdn.shopify.com/s/files/1/0437/9269/5456/files/bokovokavupazasupinuza.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/sotonabixutolukovodi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9845/files/16536334937.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6867/files/IMAGEFAP._COMHTTPS_WWW._GOOGLE._COM.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/73818136882.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9794/files/english_russian_picture_dictionary.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_off000060cb.bin
1d9091c5db4f39fa2b587f75ff4bb3cc62859328ab9a03e1675fc86ff3bcc1d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x60CB 5516 bytes
font_01_sfnt_off00007388.bin
909daa144ecc5753bc0890ffbc85a1f604a4c2100997fb44616c63cdee7c49dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7388 10076 bytes