Malicious PDF — malware analysis report

Static analysis result for SHA-256 78286f06abbaf0b7…

MALICIOUS

PDF

41.3 KB Created: 2020-08-03 12:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcf7a30b031280c1d08c23f83b923cff SHA-1: b5dca3c32b9b2b85e61b5dadb35794173a2f2252 SHA-256: 78286f06abbaf0b76d9c224527d8f649a4f1829d34bcefc88c2fe2f81e42067c
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources disguised as PDF files. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=basic+life+support+pdf+philippines'. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links suggests a link farm or redirection scheme designed to lead users to malicious content.

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=basic+life+support+pdf+philippines
    • http://files.votebrizzi.com/uploads/1/3/1/4/131483386/kenurofex.pdf
    • http://files.rivercrestgrounds.com/uploads/1/3/0/9/130969057/493574.pdf
    • http://files.elizabethkpetersonlab.com/uploads/1/3/1/3/131384789/sibufajoj-xuvini.pdf
    • http://files.northwestpetroleum.com/uploads/1/3/1/4/131453034/2688355.pdf
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/mac_3200_chainsaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5435/files/kavixojavivefenajapu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/zejelin.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/chrysler_pacifica_repair_manual_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/0078/1208/files/34620254051.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/85206425253.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8069/files/wozezepovixozagomoxefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zutowujovepenatugipo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6276/9302/files/rusux.pdf
    • https://cdn.shopify.com/s/files/1/0435/4008/6935/files/sabebapakegovuravizutil.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/teas_v_study_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5227/7670/files/xadowozizabinuteminorumad.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/87565890063.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_off0000630f.bin
5ac2526071eb20c84a36a6bd3dfa5c3a0d45e1ac3f8151489a856450443f3ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x630F 5292 bytes
font_01_sfnt_off00007507.bin
f43d276d043c20607e1d7ad1f777e0d6b1a5d65c720922398c6a381647feb0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7507 10396 bytes

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