Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e28a32552d8085…

MALICIOUS

PDF

35.8 KB Created: 2020-08-25 12:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44b667d77cadf67b788261961ec76cac SHA-1: 0b8da65a75fa88fa8e5db460d727b7c38ba06573 SHA-256: 78e28a32552d80852a36a62f87cf673f3b1d20d9277d6880b7394289c9ea5530
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to benign Shopify domains, but one critical link directs to `ttraff.com`, identified as malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'technical report example chemical engineering' and the malicious URL, suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious sites for further exploitation or phishing.

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=technical+report+example+chemical+engineering
    • http://files.thetaitungteacher.com/uploads/1/3/1/3/131382148/xusujutegojeda.pdf
    • http://penis.hrkamins.com/uploads/1/3/2/8/132814084/xadafevorogedopizugu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7552/6051/files/chennai_corporation_property_tax_self_declaration_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/1131/7658/files/polarization_of_light_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/environmental_biotechnology_principles_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/paulo_coelho_alchemik.pdf
    • https://cdn.shopify.com/s/files/1/0431/7685/3664/files/gulorejavodutamedaloronef.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/kevisize.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7127/files/39381279884.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/4616288700.pdf
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/xejogisorinejimetogo.pdf
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/architecting_modern_data_platforms_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/jotuziwujuvemefowaxakaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9160/8227/files/75599946258.pdf
    • https://cdn.shopify.com/s/files/1/0430/2215/5930/files/72320552613.pdf
    • https://cdn.shopify.com/s/files/1/0434/8660/9573/files/45444299603.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_off00004ed3.bin
24801da64edc98be9f834d8734049742c486f71b45f07c252b2c0cbaccb23293		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED3 5184 bytes
font_01_sfnt_off00006048.bin
498f14f1153c27568ed0b32a80a72844c897e28876bc15d2c0f205c94a454782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6048 9900 bytes

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