Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a371891c84a122…

MALICIOUS

PDF

54.9 KB Created: 2020-08-14 12:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17fcb9b6215ae6c0edd2acb8e2825606 SHA-1: ef4956d4b55a97f5213ce6c7ea95687eaf542a2d SHA-256: c7a371891c84a122f45257b4479962cb95ddc643ea3e2472f4de4fb97485cc33
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating a phishing or scam attempt. The document body, though corrupted, contains text suggesting it is a song lyrics PDF, likely a lure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=aashiqui+2+songs+lyrics+pdf+free, which redirects to other PDF files hosted on Shopify. The ML classifier strongly supports the malicious verdict.

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=aashiqui+2+songs+lyrics+pdf+free
    • http://files.bertram-hill.com/uploads/1/3/1/4/131455232/pilirujemokokesi.pdf
    • http://files.majorsandminorsosu.com/uploads/1/3/1/3/131380612/4fa1a0.pdf
    • http://fogetuvi.lauriesdance.com/uploads/1/3/1/3/131380344/luwir.pdf
    • http://files.coryblake.org/uploads/1/3/0/8/130874141/8777e5e.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9076/files/bozokazuxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3253/files/lasuzavodozelar.pdf
    • https://cdn.shopify.com/s/files/1/0438/2480/8096/files/45713485648.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/osrs_best_cannon_spots.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0727/files/lojakovenadopizubodo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1416/files/16518948605.pdf
    • https://cdn.shopify.com/s/files/1/0429/9315/6259/files/70837395817.pdf
    • https://cdn.shopify.com/s/files/1/0438/4312/5405/files/41827404171.pdf
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/kopalugisugufozuletejitof.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/37571251032.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1006/files/stk_amplifier_circuit_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/37203310898.pdf
    • https://cdn.shopify.com/s/files/1/0433/9597/3276/files/47250791681.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.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_off000080e3.bin
37931cb631c4f38ad53c1a4c4bef8f5d32ac16aafb2c74f3d208dcc5276fdb03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E3 5764 bytes
font_01_sfnt_off0000947b.bin
61a71451978df72eb5551e750cfbb901ae4b421db5e03151ffdcce5892e2409b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x947B 10436 bytes
font_02_sfnt_off0000b879.bin
8fe31ac2096c5e11ca20e474ac9d4b0e624cd7c6a3d6648e58269b78a2b36287		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 16304 bytes

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