Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf62429a972b0e91…

MALICIOUS

PDF

37.8 KB Created: 2020-09-17 08:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ae25b913d05532a2791efbd102dae14 SHA-1: ca70bc2549657838728557d7fc61f87babe95106 SHA-256: bf62429a972b0e91abdafb012ff93011be9eb5d9f934675a52926b9bfe4cd054
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to a known malicious redirector infrastructure at 'ttraff.me'. The document body and heuristics indicate a lure for downloading software, specifically mentioning 'towelroot v1 apk download'. The presence of numerous external PDF links suggests a link farm designed to attract search engine traffic and potentially distribute malware. No scripts were extracted from this sample.

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.me/wix?keyword=towelroot+v1+apk+download
    • http://zorumot.yrpm.ca/uploads/1/3/0/7/130775565/763de2.pdf
    • http://files.littlelotuswellness.com/uploads/1/3/1/4/131405977/xuxagit.pdf
    • http://files.nruzycki.com/uploads/1/3/2/3/132302963/1056549.pdf
    • https://76a5ac18-70cd-413f-85a0-991c05070f4a.filesusr.com/ugd/70e7d4_890ce8ae309e430a9cff075cbf7df3b4.pdf?index=true
    • https://67ad27be-671b-4133-a2ca-34567acc1bdb.filesusr.com/ugd/98e298_1987b7e6aa42421ea94732624b68539c.pdf?index=true
    • https://fe739324-2664-4e0a-97e0-0ed75d107b4a.filesusr.com/ugd/f967ac_5e57b6149cff4bbbb0ed81465da73412.pdf?index=true
    • https://8b10138e-e1f3-40d3-9397-30f95ff654eb.filesusr.com/ugd/0a052f_76916c0dc8f54ba4be0b1715faba743e.pdf?index=true
    • https://bbe97897-9334-40e4-933e-5784d3b3d431.filesusr.com/ugd/84a5c6_17446f9d50e64ccf957158d131c688c1.pdf?index=true
    • https://f008be9d-ff5a-4de7-a70d-624661165c24.filesusr.com/ugd/6cf392_3eaf847de44e42098020310e537a5d2f.pdf?index=true
    • https://ab72c2e8-a771-4a9c-95e7-3530b19af9d8.filesusr.com/ugd/e2f7e1_2b1e087a009c47ada6eedb4e92776caa.pdf?index=true
    • https://f406d812-8548-4fb2-81d7-baab8ab6e80c.filesusr.com/ugd/c70c35_0c235ff806fc48ff9bb88b378a219349.pdf?index=true
    • https://ee7d70c6-29cc-4bcd-bacd-a86b8156c615.filesusr.com/ugd/23a6c3_0f405eefb120490c9ac5b0322d2fb275.pdf?index=true
    • 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_off00005706.bin
9e459dfac096766b37f4193669912f364582a2ccaad2c9fee690d16bd0ef9eb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5706 4992 bytes
font_01_sfnt_off0000682d.bin
a8a9dec4dd6611648b951f1abc4817a7fc3876ed88c52b04c76f03020038b504
pdf-font-stream PDF embedded font (sfnt) at offset 0x682D 10104 bytes