Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31ae800337ed37b…

MALICIOUS

PDF

40.2 KB Created: 2020-08-10 04:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8dd2c5a57a369110300b8ea4e608a7a SHA-1: b376f4167dc9ae2b8a59cf0db11134138f4fa790 SHA-256: c31ae800337ed37bc37997241f049bf692d9013cd8e53e55a9e4fc12290a052e
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a search result for programming-related content. This suggests a phishing or social engineering attack aimed at directing users to malicious sites. The PDF also hosts a large number of links to other PDFs on Shopify domains, likely as part of an SEO poisoning scheme to improve search engine ranking for malicious content. No scripts were extracted, but the presence of the malicious redirector and the SEO link farm strongly indicate a malicious intent.

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.com/pify?keyword=simple+calculator+program+in+java+source+code+pdf
    • http://sexevoz.crotonlibrary.org/uploads/1/3/1/4/131407406/c0c59e8.pdf
    • http://files.ukenglishmyanmar.com/uploads/1/3/2/6/132681779/munusenifudoku.pdf
    • http://files.benningtonbaseball.net/uploads/1/3/1/6/131606227/jezaboge.pdf
    • http://files.intlconference.org/uploads/1/3/1/6/131607712/riveluditesiza.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/on_cooking_5th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/7579/5099/files/jowukujuwewigibixefojepig.pdf
    • https://cdn.shopify.com/s/files/1/0429/9243/5359/files/castlevania_gameboy_advance_rom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18410569865.pdf
    • https://cdn.shopify.com/s/files/1/0434/7494/4153/files/64201611537.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8124/files/mubonepozikebofil.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/auditoria_contable_ejemplo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4160/files/consumer_reports_best_mattress_for_back_pain.pdf
    • https://cdn.shopify.com/s/files/1/0430/8339/9329/files/65877342336.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4476/files/37218867658.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/input_output_buses.pdf
    • https://cdn.shopify.com/s/files/1/0437/7739/2794/files/88780350570.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_off00005ecd.bin
d42ba31f849bb96b93489493cdd3e04880ae3a786830d360b6ea9c1e19b218ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECD 5716 bytes
font_01_sfnt_off00007238.bin
375659c8a45d6307b86f431dfe7116f3f80df13b63416a9c2af9a525360acac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7238 9736 bytes

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