Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cdfd8e587ccc3f…

MALICIOUS

PDF

55.7 KB Created: 2020-08-22 06:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e4a9b3c41de3c6411d1513e74329c8f SHA-1: d3120585506a3f2d65683b5bcf307c976ab0848c SHA-256: b1cdfd8e587ccc3f8592a68046fb6d981e9bdad87b5eef0df5813433161d9100
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is designed to lure users with the keyword 'android backup service apk'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to malicious infrastructure via a deceptive link.

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=android+backup+service+apk
    • http://fodexa.perchancetheatre.com/uploads/1/3/1/3/131384600/a803713e2fb1d8.pdf
    • http://fosari.heshooktheworld.com/uploads/1/3/0/8/130814328/6175615.pdf
    • http://mowonej.cindysearles.com/uploads/1/3/1/3/131380999/ee4ebc4.pdf
    • http://files.carrollcountyfarmersmarket.org/uploads/1/3/1/4/131453536/40823df9.pdf
    • https://cdn.shopify.com/s/files/1/0435/5103/1447/files/66880026955.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5061/files/neveligo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6734/9923/files/pdf_to_word_converter_app_for_pc_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5317/7237/files/cricket_rules_book_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/subevuvugup.pdf
    • https://cdn.shopify.com/s/files/1/0435/3556/4949/files/sifopuzegitek.pdf
    • https://cdn.shopify.com/s/files/1/0430/7592/8215/files/rawakobeduminisedaze.pdf
    • https://cdn.shopify.com/s/files/1/0433/9774/2750/files/european_society_of_cardiology_guidelines_pregnancy.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bebupikisanomagidilu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3067/3565/files/supekadunizodewef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088a1.bin
c5a193fa7449467837a8bf6386b7e1498c0d4e1bc721f126c0c0aff99bfa63b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A1 5088 bytes
font_01_sfnt_off000099ea.bin
5d982b96e07315b3dca202ffc76aa196eb12a12298d185e1bcfe1e9e76ccb505		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99EA 12792 bytes
font_02_sfnt_off0000c38a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC38A 4324 bytes

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