Malicious PDF — malware analysis report

Static analysis result for SHA-256 105ec7ef71a63687…

MALICIOUS

PDF

53.4 KB Created: 2020-09-02 13:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18fbb10139f3bb64a65bf0e055cd7e3d SHA-1: d666656fde14d794db2e714e76224e35eb820f05 SHA-256: 105ec7ef71a636871f1b258decf789583c8b2f6571351a458b5665936e4b9c3a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links that lead to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that aligns with the advance-fee scam lure identified by the SE_ADVANCE_FEE_SCAM_LURE heuristic. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.me/wix?keyword=usb+wifi+adapter+android+tv+box
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_a2069fcc385d483c8417b5d2b6ac7d3a.pdf
    • https://static.usrfiles.com/ugd/c63bf9_e7acfd50ec334aa399926298a2ff71ed.pdf
    • https://static.usrfiles.com/ugd/430cb2_c4b5306410424908b1e9913a839c51c5.pdf
    • https://cdn.shopify.com/s/files/1/0429/2440/8988/files/autocad_2013_64_bit_highly_compressed.pdf
    • https://static.usrfiles.com/ugd/99a8f2_5798d4360cfa45b4a899e175ee9d18b0.pdf
    • https://static.usrfiles.com/ugd/ce14f3_6048e41abc034f768095e41d6c784a19.pdf
    • https://static.usrfiles.com/ugd/e3834b_403a5ce048a740e6bce074710ff072c9.pdf
    • https://static.usrfiles.com/ugd/5926b4_d761804461cc4f3582f4504d73732b34.pdf
    • https://static.usrfiles.com/ugd/429b25_5cec6bbba7bd4203a7b85b0671864a0b.pdf
    • https://static.usrfiles.com/ugd/1e32c2_891a2ba97335493f91c0b0ae51e9c15a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f8a.bin
a44a81de432d906a1c751806bca7e5c064e4062c5a3b7942e4759eabb414f4de
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8A 5356 bytes
font_01_sfnt_off000091e0.bin
5e911379212900480349de9991d9631c9863c43c1c46ce497c251b842144b917
pdf-font-stream PDF embedded font (sfnt) at offset 0x91E0 5004 bytes
font_02_sfnt_off0000a3f3.bin
e13a96b8a3788750b8e051e5dbfdd081c5a8aa90b4ee45235ebe4607a2d4b797
pdf-font-stream PDF embedded font (sfnt) at offset 0xA3F3 10684 bytes