Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f73e6435012837…

MALICIOUS

PDF

57.1 KB Created: 2020-08-17 00:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e508dcd89dd488596bc07092e185df16 SHA-1: 4dc70c7a3ebba7b6871fb76da90171c3676c98eb SHA-256: 33f73e6435012837006e4824f66591026b0d6f29d6a11e01d65dae655d81502c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that leads to a redirector, suggesting a phishing or scam attempt. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points towards a link farm or SEO poisoning tactic.

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=dispersion+photoshop+action+free++mac
    • http://files.imaginationdestinationstravel.com/uploads/1/3/0/7/130739831/1336876.pdf
    • http://zixovoga.alejandrodu.com/uploads/1/3/0/7/130739197/5728140.pdf
    • http://fabasadi.ucitylourdes.org/uploads/1/3/1/8/131857419/2465106.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4646/1855/files/mammalian_cell_culture_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/convert_docx_to_doc.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/french_alphabet_letters.pdf
    • https://cdn.shopify.com/s/files/1/0431/0568/1562/files/gileradejipen.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/nabozanavuvezimaziwapi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6113/2968/files/leruv.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/wisinisotamiva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/4422565892.pdf
    • https://cdn.shopify.com/s/files/1/0428/6382/0959/files/54739048963.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_off00009a1e.bin
5007eec0d932a02af7b417eb32429e045e90c45b59bded9851c7565aae494e6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A1E 5224 bytes
font_01_sfnt_off0000abb8.bin
b43bd83fa52e58a40239c88da715c6e0e6f76c0f09cc64fb5cba6951ec95463f
pdf-font-stream PDF embedded font (sfnt) at offset 0xABB8 13788 bytes