Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cdd44ec7a40e16…

MALICIOUS

PDF

46.5 KB Created: 2020-08-21 16:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e80553c54d9cd5c536c257277b1b3e31 SHA-1: fb0136868258bd576106b6f307e6f7b60dec5079 SHA-256: 34cdd44ec7a40e16fc2bb028abe1259a52d611e86c25b9d011abc3e471bfd287
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDFs, with one primary link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=cite+video+mla+format', which is flagged as a malicious redirector. The presence of a large number of embedded links, many hosted on Shopify, suggests an attempt to obscure the malicious destination and potentially leverage the reputation of the hosting platform.

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/pify?keyword=cite+video+mla+format
    • http://files.octreeconsulting.com/uploads/1/3/0/7/130776483/6898513.pdf
    • http://files.tbstglassboro.com/uploads/1/3/0/8/130873921/5074221.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/rotapetajawanufenupev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0444/2734/6086/files/alquran_dan_terjemahannya_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/jumabomupajo.pdf
    • https://cdn.shopify.com/s/files/1/0450/7539/8821/files/beginner_excel.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/pegumasafiwewurire.pdf
    • https://cdn.shopify.com/s/files/1/0441/2270/1976/files/67006438790.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/tips_for_happy_life.pdf
    • https://cdn.shopify.com/s/files/1/0432/9108/2918/files/15615660238.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/libro_alter_ego_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/40083001501.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_off0000785d.bin
f3b90316d831b5a97815a9530c0e01ff1a26adac22970c57d48f478410a9d53d
pdf-font-stream PDF embedded font (sfnt) at offset 0x785D 4840 bytes
font_01_sfnt_off000088c0.bin
e6ca9a8dde61675c68a24ef4fb6098d48c36068567036cdc9958ce3f82995205
pdf-font-stream PDF embedded font (sfnt) at offset 0x88C0 10716 bytes