Malicious PDF — malware analysis report

Static analysis result for SHA-256 2032de7c401fb5d3…

MALICIOUS

PDF

59.4 KB Created: 2020-08-11 20:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1c2fa574fff251e2f5d3acefb2ee2ed SHA-1: 6de3d3a073a6adf3e87301e46f65ccec3f076272 SHA-256: 2032de7c401fb5d3d3b4b6ccdbd7f42ffd2b82bd3dc085f38a09ad066de7ec0f
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector (ttraff.com). The heuristic PDF_SEO_LINK_FARM indicates a mass external PDF link farm, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

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=askep+pada+anak+dengan+bronkopneumonia+pdf
    • http://sezigot.wteainfo.org/uploads/1/3/1/4/131407406/vakuzinixujubi-wijulem.pdf
    • http://mumiwax.girltechnician.com/uploads/1/3/0/9/130968917/e6da96.pdf
    • http://files.alivechurchdm.org/uploads/1/3/0/9/130969061/028445.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/nojuneroxalunefewile.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/muradopoligar.pdf
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/94819739868.pdf
    • https://cdn.shopify.com/s/files/1/0428/2246/7750/files/91846588004.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5194/files/uwu_chrome_extension.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/77557074511.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/kissasian_the_heirs.pdf
    • https://cdn.shopify.com/s/files/1/0430/8959/2473/files/cerere_inmatriculare_auto_gorj.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6006/files/bonulalileti.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/dark_souls_2_item_ids.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebedaxogatasimilore.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/vulakegajeli.pdf
    • https://cdn.shopify.com/s/files/1/0435/2039/3375/files/88757810176.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_off0000aab4.bin
eacad244e8663ecd8692a93e5658ff5d6f419b95a164dfd509122830784576c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB4 5524 bytes
font_01_sfnt_off0000bd56.bin
f51e63736446487711e1c39d79101c1c23afb047f1e3fe40d8fa43c35613671e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD56 10140 bytes