Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e25d7c590e54457…

MALICIOUS

PDF

54.7 KB Created: 2020-08-06 13:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19ca2360c2b2a92316b31b674b3ac3af SHA-1: f15617765388085f9265c526e21a5bf348099596 SHA-256: 3e25d7c590e544572a084061fc93082e593cdace9480d373babf130d8ee49995
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=cerebrovascular+disease+review+pdf'. This indicates the document's primary purpose is to lure users to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. No scripts were extracted, limiting the analysis of further payload delivery mechanisms.

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.cc/pify?keyword=cerebrovascular+disease+review+pdf
    • http://files.dglanded.com/uploads/1/3/0/7/130775135/pobiwuze.pdf
    • http://vovibuwoj.billsnwphoto232.org/uploads/1/3/1/4/131453645/ridumejufekimew.pdf
    • http://wolirek.dankcityclothing.com/uploads/1/3/1/4/131437363/keridezaxomuwiwim.pdf
    • http://files.donzhenphoto.com/uploads/1/3/1/6/131637529/jotijireze.pdf
    • http://files.alex-key.com/uploads/1/3/0/7/130776008/guzeben-bakibenowe.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8741/files/19027881271.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/65568604542.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1204107997.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0804/files/wasirisitasoziwotosogo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/95961955190.pdf
    • https://cdn.shopify.com/s/files/1/0432/6290/2438/files/pijaxanetumurezanuzisaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7542/files/buzutunolenosifefe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2784/0669/files/97042311840.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/18729667678.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/74350485731.pdf
    • https://cdn.shopify.com/s/files/1/0431/2629/2634/files/34063288870.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_off000089bc.bin
5c02a115d2bebb3a19df5154833c6d346c0434c50eeab574daf9646c467dd6dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89BC 5160 bytes
font_01_sfnt_off00009b63.bin
f8db326cc1f4d22bf52b9a56fa241c4e9dfa56c802b7398f12c857bba0f677f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B63 10440 bytes
font_02_sfnt_off0000bf1f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1F 4324 bytes

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