Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fcf9fa6fe60355…

MALICIOUS

PDF

42.5 KB Created: 2020-09-17 11:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e0bc58f0b83b1da30e4a3c74be46547 SHA-1: 786dd84d0c1429731d1ec89d016d10b92721acde SHA-256: b3fcf9fa6fe6035527f7c7f9f5c514a301105a47c9333b887be91f197e8158af
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes a URL that matches the malicious redirector identified by heuristics. This suggests the document is designed to trick users into visiting malicious websites, likely for phishing or malware distribution. The presence of a large number of external PDF links further indicates a link farm or SEO poisoning attempt to obscure the malicious destination.

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.club/wix?keyword=to+kill+a+mockingbird+chapters+7-11+reading+guide+answers
    • http://buxil.charlottes-eportfolio.com/uploads/1/3/0/7/130739651/wegijogugabodox_xazivu_baxegeje.pdf
    • http://babeme.loonfeatherleather.com/uploads/1/3/0/7/130739616/7431875.pdf
    • http://files.atayloredapproach.com/uploads/1/3/0/8/130814529/mivexefijoloj_nakefis_suseri.pdf
    • http://files.skywaterlabradors.com/uploads/1/3/0/7/130775866/zukavodulama_rusifixazimos_lurabo.pdf
    • https://a8d7bd0d-6c66-4a30-ab4f-fab486288eaf.filesusr.com/ugd/78daac_0b24532804444558965df3de556b5a13.pdf?index=true
    • https://9b8e3f72-b375-402f-9005-0092637732fe.filesusr.com/ugd/5aec95_ee680645975b4021a348000e3710492e.pdf?index=true
    • https://886f1fca-e6a6-4880-b21b-4aae4ac25654.filesusr.com/ugd/3c8574_326a69fa4b5248cab4308c749ca6d3e0.pdf?index=true
    • https://e187a90a-32eb-4e52-ab53-36d6f128a210.filesusr.com/ugd/694d5d_09e0cc2651054acabae677549a725859.pdf?index=true
    • https://3d933e7d-3119-4be9-a4b1-5fec79fe02bb.filesusr.com/ugd/18ee90_9cc0bef6976f42798bd505b7e57e2876.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/farelotubez.pdf
    • https://cdn.shopify.com/s/files/1/0431/2825/8726/files/fuziveriguzijagekanawa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8560/1695/files/gizujabefiru.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/50400971157.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0486/files/97028768249.pdf
    • https://cdn.shopify.com/s/files/1/0437/1424/8857/files/wordscapes_answers_1243.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/rearrange_sentences_for_class_3_with_answers.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/
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/rea

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066a9.bin
67ac2c5d98f9b324a3422b52cf4d6a332c5a8be1b16ed7ebbfceeebe0b451285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A9 5896 bytes
font_01_sfnt_off00007aad.bin
98f4fcad775c08a25769c9df57af463b00993e37e51031fc2f4b90a0a2a66526		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAD 9948 bytes

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