Malicious PDF — malware analysis report

Static analysis result for SHA-256 328da23f7591cd05…

MALICIOUS

PDF

46.3 KB Created: 2020-08-29 18:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2ad5b609361bd5c6bcb79727444cb5d SHA-1: 80110d4364dd7ff74f84de77c084db1b49611643 SHA-256: 328da23f7591cd05b0df95cc522196fd5b3c12954aaf3a60c03addf744c0aa59
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as a student CV for university applications. This is further supported by heuristics indicating a malicious redirector and a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through a deceptive link.

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/wix?keyword=student+cv+for+university+applicatio
    • https://static.usrfiles.com/ugd/b8c837_c86cb1598eb6493585615c847688f11f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec75e064e67140e6a819ade02fb77d06.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3b7170ea93f486198b35239bbecb89d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cba043c14bd4ee79519e9e6063bc1b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9ba99c7a4b24ae69c9c8d3a7931dd0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_60818dd9cbe14df4bd4bec0b9b691139.pdf
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/22343961959.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9751/files/fovoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/32617936179.pdf
    • https://cdn.shopify.com/s/files/1/0428/7063/6710/files/kugurakedekotuluni.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_off00007691.bin
f779bdd2135d5eaf69b9264805f06d3009365195a942c09bf82d3c32845f21d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7691 5416 bytes
font_01_sfnt_off00008912.bin
18a8d90ec28364276ce3bcf4f3b443a4c4214065f3dc0ec3d329525d84eac7b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8912 10456 bytes

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