Malicious PDF — malware analysis report

Static analysis result for SHA-256 742c3960df81c9fe…

MALICIOUS

PDF

47.6 KB Created: 2020-08-12 01:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf2ebd74395e234bd2e4cd3af068424 SHA-1: e5bd5b18dd790e5fb45e79c3d5d74d5a6d66c081 SHA-256: 742c3960df81c9fe434a9abdc5ee25a0a639b7b41634501fed6a51f47ead0b14
194 Risk Score

Malware Insights

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

The sample is a PDF that contains numerous embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that, when combined with the heuristic findings, strongly suggests an advance-fee scam lure. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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.com/pify?keyword=mns+blood+group+system+pdf
    • http://bavudi.bestmusicteacherever.com/uploads/1/3/1/8/131871883/litegofitebupe-pazad-zivifaxogewi-nolurugurevusal.pdf
    • http://files.sedistrictpaha.com/uploads/1/3/1/4/131438538/9cb16.pdf
    • http://files.onlineloan-payday.org/uploads/1/3/2/6/132681824/409819.pdf
    • http://sojiw.chloemannphotography.co.uk/uploads/1/3/0/8/130815009/1b9f9f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7714/7547/files/bikalufigepakisab.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/91428856532.pdf
    • https://cdn.shopify.com/s/files/1/0435/1652/6752/files/62302566704.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/85154295475.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/60892530267.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/project_on_working_capital_management_in_banks.pdf
    • https://cdn.shopify.com/s/files/1/0449/8436/9311/files/raquitismo_hipofosfatmico_familiar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12091312038.pdf
    • https://cdn.shopify.com/s/files/1/0437/3997/1736/files/16655443343.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/72295065407.pdf
    • https://cdn.shopify.com/s/files/1/0435/6653/0728/files/pavepipulepanas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7832/8224/files/9756628785.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/8744991134.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_off00007b69.bin
b1c13e548bb3e8851af0834ce53cdc1c6d516135d8fb90314d9d900e87af4caf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B69 5400 bytes
font_01_sfnt_off00008dbd.bin
5394179dfeb88e944bb1b0a98893b69874b5eb74c2a2e65670a328f497d85fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBD 10660 bytes

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