Malicious PDF — malware analysis report

Static analysis result for SHA-256 1513e863216733dc…

MALICIOUS

PDF

40.5 KB Created: 2020-08-29 23:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45aff16a42801fc0f13b6eb7c7c25870 SHA-1: 0f2330e719c5a4a4983bce270efd0033ac3670fb SHA-256: 1513e863216733dc81b1a3389a124b31d84daec84339f3278ce7089a6ec183e4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector URL, which is flagged as malicious. It also hosts a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector. The ML classifier strongly indicates maliciousness.

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=elite+girl+soccer+league
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_b89b70d13faa442ebdba2253dfcfa388.pdf
    • https://static.usrfiles.com/ugd/b8c837_662e2525352344729c28af723ced9027.pdf
    • https://static.usrfiles.com/ugd/b8c837_25e5364966a24a79aedad58f0850a1e0.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/good_evening_time.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7112932bd574c32bcf9b88ad9cab949.pdf
    • https://static.usrfiles.com/ugd/b8c837_9096d5bc6f8d4641a47c47d913564d34.pdf
    • https://static.usrfiles.com/ugd/b8c837_0eb3a93c1f1a424090ce6f63b8e968f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1a8d8fb428a40da929200404155cdd1.pdf
    • https://cdn.shopify.com/s/files/1/0460/1869/1239/files/88987792787.pdf
    • https://cdn.shopify.com/s/files/1/0433/6828/4319/files/importance_of_essential_amino_acids.pdf
    • https://cdn.shopify.com/s/files/1/0433/0248/6180/files/bukeliwixujodolifosof.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9845/files/hyponatremia_guidelines_2017.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000632f.bin
bae611f09c62c5f727b498ad05099518739925e376f0e78004f74d4e6210de6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x632F 4924 bytes
font_01_sfnt_off00007404.bin
746c0de063064e14d02cdd81d4023c8393b9f08ef96a65dcae4a59566e3fcb69
pdf-font-stream PDF embedded font (sfnt) at offset 0x7404 9852 bytes