Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4116717ccc6274e…

MALICIOUS

PDF

39.7 KB Created: 2020-08-27 23:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c99110019e57940841e3c23ad9e3a47e SHA-1: 264378fdc139170e2ed0d31ede3315c92b55b8bb SHA-256: b4116717ccc6274e3ea550e88d16cd19eb702662c85db1eaf5675342338d83a8
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous URLs, with the primary suspicious URL being https://ttraff.ru/pify?keyword=el+adulterio+david+hormachea+pdf, which is identified as a malicious redirector. The presence of 19 generated SEO PDF links further supports the attack pattern of distributing malicious content through a large number of external links.

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=el+adulterio+david+hormachea+pdf
    • http://files.westfieldbouncehouserentals.com/uploads/1/3/1/3/131384789/4605166.pdf
    • http://files.livshairandbeauty.com/uploads/1/3/1/4/131437657/906a0d7.pdf
    • http://files.mollybooth.com/uploads/1/3/1/4/131406749/xegugadino_jedib.pdf
    • http://zebelej.thierryrmontoya.com/uploads/1/3/1/4/131438641/zojiwi_jobaxi.pdf
    • http://dedilejo.stpaullevittown.org/uploads/1/3/2/3/132303354/juxekajebase_xejek_fimogijezum.pdf
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/worksafe_wa_risk_assessment_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/6521/1035/files/61450583077.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/32965383450.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/59522981116.pdf
    • https://cdn.shopify.com/s/files/1/0440/8524/8165/files/veveveximapegiwiravapa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/shijou_saikyou_no_deshi_kenichi_ova.pdf
    • https://cdn.shopify.com/s/files/1/0434/1035/8439/files/ayurvedic_yoga_therapy_mukunda_stiles.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2742/files/borotivo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4198/7479/files/janatananodokakovemowejel.pdf
    • https://cdn.shopify.com/s/files/1/0434/6419/6256/files/possessive_adjectives_exercises_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0435/8121/0787/files/58725398186.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/network_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/pdf_bestand_verkleinen_met_acrobat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3488/files/piroluzut.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_off00005aa0.bin
3e22a8fb3514085acf8d2969291e35a3f6eaa202cdb916e09d6f82693fd296f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA0 5236 bytes
font_01_sfnt_off00006c54.bin
27abdfcfe474b7ca43325dff6784a7c2b208122037c97943f7a55639c78ff10d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C54 11036 bytes

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