Malicious PDF — malware analysis report

Static analysis result for SHA-256 868f73869abad77d…

MALICIOUS

PDF

43.3 KB Created: 2020-07-31 01:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2610ae889d7a10a65aedf05e8ba3ab55 SHA-1: 701b2fa4a04e1e8d1eef55c4b6f32b43f7b614d7 SHA-256: 868f73869abad77ddc8fae1bab954e5e67b0e648d4904b407e5bf92a6abc765f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.cc'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, with the first pointing to a Shopify domain. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Algebra questions and answers pdf grade 7', likely a lure.

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.cc/pify?keyword=algebra+questions+and+answers+pdf+grade+7
    • http://files.growingupguinn.com/uploads/1/3/2/7/132740415/55834ee944ac.pdf
    • http://files.catcaricature.studio/uploads/1/3/1/3/131397950/jowededevamajen-jafugejejomisi.pdf
    • http://files.ottawaherefords.ca/uploads/1/3/2/6/132681304/4971360.pdf
    • http://files.vickihendricks.com/uploads/1/3/0/7/130738894/gizuwagusuva_sufufojor_vujidaxewatipot.pdf
    • http://files.vickihendricks.com/uploads/1/3/0/7/130738894/gizuwagusuva_s
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/vatinejorap.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/taboveludige.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/bikidebaba.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/93862553419.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/25784995791.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/satevawejelefuwisozef.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/bizikaxekaxiti.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/sagisexopoda.pdf
    • https://cdn.shopify.com/s/files/1/0432/3665/5259/files/muzafetanapojitetuwo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6612/0609/files/dopeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/24934714287.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_off00006abd.bin
7e7a77418e0edde2ef54b74b7cd0c5db5185cfd05d11be1de766994664ed9f1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABD 5516 bytes
font_01_sfnt_off00007d94.bin
ff6a58873b80c9e1206dc8a45d66b28a46905cc4508a06ccd9a519cda51dff59
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D94 10216 bytes