Malicious PDF — malware analysis report

Static analysis result for SHA-256 137ce240a07ebc4d…

MALICIOUS

PDF

36.0 KB Created: 2020-08-14 11:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0172546b2e456c31c54162b71aec4c8 SHA-1: 8fd1dfb77c578dfd2dd450491d5f5ce02c678d63 SHA-256: 137ce240a07ebc4d492c906cacc39f669509daea29524fad958cb408f1659062
154 Risk Score

Malware Insights

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

This PDF document contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document also features a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment.

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=champaign+illinois+weather+report
    • http://files.tcccmi.com/uploads/1/3/2/6/132682681/pofelij_tegixumobulewov_butenijesig.pdf
    • http://files.christhomasguitar.com/uploads/1/3/0/9/130969356/906331.pdf
    • http://dorutal.rochin.com/uploads/1/3/2/6/132682565/2d39a926.pdf
    • http://files.uncommonpracticesweboffice.com/uploads/1/3/1/4/131453917/280b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/41010905300.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/jabumovegadowavu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4683/7151/files/60613812648.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/bohemian_rhapsody_partitura_guitarra.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/wokixafa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/rf_to_fe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dotedijulukamani.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1512/files/48937514839.pdf
    • https://cdn.shopify.com/s/files/1/0454/7146/5630/files/dagobakobojo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/tigofejoludesajuf.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_off00004efb.bin
7c43c89c4f3a2181962885c87c284f4c5d9661409a0ead23dee689d31b9b0ff2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EFB 5232 bytes
font_01_sfnt_off000060b5.bin
9c153b10b4ae46281c92c9bbd59cfcc7ff79c33bfc34cd802e54faf483a27098
pdf-font-stream PDF embedded font (sfnt) at offset 0x60B5 10124 bytes