Malicious PDF — malware analysis report

Static analysis result for SHA-256 a329cb36afa7a11c…

MALICIOUS

PDF

47.7 KB Created: 2020-07-30 01:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dee6c3bfffeee6db03998d0ee48bb8a2 SHA-1: 3d92562ff0b24625936b9dbbc5639f5fd8ea772b SHA-256: a329cb36afa7a11ca21584a0e67d4cbd5308ecdc3f4d635f2ec302534d22750a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is ttraff.com, which is used in conjunction with a keyword suggesting a lure for academic or technical documents. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is designed to drive users to external, potentially harmful, content.

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=cours+automatique+asservissement+pdf
    • http://files.beeholistic.com/uploads/1/3/0/8/130815303/degotetobumesowuwibo.pdf
    • http://files.simamartialarts.com/uploads/1/3/2/6/132681053/rigozipu.pdf
    • http://files.cornerstonelibertycommunitychurch.com/uploads/1/3/0/9/130969494/tiwegasekibuxomab.pdf
    • http://files.dsdominion.org/uploads/1/3/1/6/131606222/kiginola-ziroguwamovo.pdf
    • http://files.cornerstonelibertycommunitychurch.com/uploads/1/3/0/9/130
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/totavari.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/datisoragibubumovosozeka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdf
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/tilaxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/78220615053.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/nolus.pdf
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/22719693563.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/6397221525.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/68574886198.pdf
    • https://cdn.shopify.com/s/files/1/0437/1267/5990/files/6194838935.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vazakiliduvapi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/68814812898.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_off000078b8.bin
50100f798e791c6eea70f5eb70b8f473476d50170c507c39a39d671217a6dc13
pdf-font-stream PDF embedded font (sfnt) at offset 0x78B8 5248 bytes
font_01_sfnt_off00008a84.bin
d4c2789fde0f16036cabe2318944325acb965d4642cca68d81bda074f6b5ef23
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A84 11740 bytes