Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3ab6f285cf6086…

MALICIOUS

PDF

53.7 KB Created: 2020-09-01 06:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d44871b72541bbcf8a19151cc0516c60 SHA-1: 8288fc30d5e1a1f622290b1bd7493e1a50c24025 SHA-256: dc3ab6f285cf6086bbe68813bb80ea222c4ba908632ab6e0947ed819f06c8e15
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a helpful resource for 'wifi signal booster for windows 7'. The primary malicious link, https://ttraff.ru/pify?keyword=wifi+signal+booster++for+windows+7, is a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure includes numerous links to external PDF files, suggesting a SEO-based distribution or redirection tactic.

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.ru/pify?keyword=wifi+signal+booster++for+windows+7
    • https://static.usrfiles.com/ugd/ea78e0_3d90cc8671ac4c2b864668dcd0717b8b.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_a2e279086ea24bc6abacbcb1aea34959.pdf
    • https://static.usrfiles.com/ugd/48d9a1_4bb79c5d6dba4a2190e175524a139c53.pdf
    • https://static.usrfiles.com/ugd/1d64af_572dfd998931473d84be536f8c642e9e.pdf
    • https://static.usrfiles.com/ugd/fd30ac_a06b977b63584078803dd4b3060e76ea.pdf
    • https://cdn.shopify.com/s/files/1/0433/3345/1926/files/borderlands_pre_sequel_infinite_loop.pdf
    • https://cdn.shopify.com/s/files/1/0448/5667/2418/files/convex_hull_python.pdf
    • https://static.usrfiles.com/ugd/538d67_cd8834bd07604614a8649e29d1bb1316.pdf
    • https://static.usrfiles.com/ugd/738632_f5f56b076ce640fca1b1f637b761cbed.pdf
    • https://static.usrfiles.com/ugd/0df15e_92f2ec4398044abc987e7452787b6d49.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_1c49885dffbc4510b926eac65a6fc0e3.pdf
    • https://static.usrfiles.com/ugd/6908d7_d22a7afe6bfa4518884cbf1d884ae844.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38664456414.pdf
    • https://cdn.shopify.com/s/files/1/0435/3110/8504/files/21778126728.pdf
    • https://cdn.shopify.com/s/files/1/0437/2276/8538/files/lavedopusani.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070da.bin
b5a7e117d6adbf609445c063eb79a0145b64716d56831aeafa9d5ba83ba41865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 5188 bytes
font_01_sfnt_off000082a1.bin
97d040be574f2ecf8fd678272b8c59c8aa690f6e780d0d8402533fd0b9821fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A1 10528 bytes
font_02_sfnt_off0000a6c4.bin
e7273338525a866f49bd556f13a0e46ce1e8513f85f175d9d987aa1f8b89adb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6C4 16068 bytes
font_03_sfnt_off0000bb68.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB68 4324 bytes

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