Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f784fb8f3be91ff…

MALICIOUS

PDF

34.7 KB Created: 2020-09-01 17:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d241ab6011ab054cecf71500a08a5d2 SHA-1: 57b3784b317e458c618c7b759030ad1c5fdc1260 SHA-256: 7f784fb8f3be91ffcb1d47f953d2ed8391abd2897d31596df8ab543862fb9cca
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a worksheet title. The document body, though heavily obfuscated, contains this URL and other benign-looking PDF links. The presence of a malicious redirector suggests an attempt to lead the user to a malicious site for further exploitation or credential harvesting. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=multiplying+polynomials+using+distributive+property+worksheet
    • https://static.usrfiles.com/ugd/b8c837_bdfd312934db4f7abe1f82318d54d2ac.pdf
    • https://static.usrfiles.com/ugd/1a89c8_d0366bf94cf647168ba91afff6ce005c.pdf
    • https://static.usrfiles.com/ugd/6cf392_d80d41fcd0944e04bea204e989e42459.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/74139604733.pdf
    • https://cdn.shopify.com/s/files/1/0459/7157/0855/files/linear_inequalities_examples_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/disilapugifadevoregipe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0872/1049/files/52628374482.pdf
    • https://static.usrfiles.com/ugd/b85eb0_f61b3aa6d8b64ce4bafa64e5fa88836f.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ba1575a95e042ae8e625d3dd533067c.pdf
    • https://static.usrfiles.com/ugd/1813b3_a5807394aca249ae9c5e4c35975364ea.pdf
    • https://static.usrfiles.com/ugd/f523c3_e89f1649d73b4a469f9ceb6647ea7a05.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_91762d0886964ac88e9e4e221dae2ca2.pdf
    • https://static.usrfiles.com/ugd/e00bd3_5d2bf25a867646ddbdf2956d2f8dbeb5.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_off0000485b.bin
bfd9346759315094f44e5ce16c945f43d191e72d84b1f70d7f146c9aa7019c75
pdf-font-stream PDF embedded font (sfnt) at offset 0x485B 5836 bytes
font_01_sfnt_off00005c23.bin
52006543eb0f0a97e7a98e9d590c1639b3358b9f6f5b0dfdb1834704cce71b53
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C23 9780 bytes