Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f84b43d00791224…

MALICIOUS

PDF

58.5 KB Created: 2020-08-02 16:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eea95627416e664a95538b3b8715e96 SHA-1: 6bc5d79ea414725ce0c5302e33521a43cfc8605b SHA-256: 4f84b43d007912241443e9527f9a5284d22a5422544b3d4ee52d879eed591285
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, includes the text 'Basic electronics questions and answers pdf' and the URL 'https://ttraff.com/pify?keyword=basic+electronics+questions+and+answers+pdf', suggesting a lure to a phishing or malware distribution site. The presence of a large number of external PDF links further indicates a link farm or SEO poisoning attempt.

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=basic+electronics+questions+and+answers+pdf
    • http://files.publishedbywestview.com/uploads/1/3/0/8/130874509/6060171.pdf
    • http://files.dmcreativemedia.com/uploads/1/3/1/6/131606429/numupajakek-vebuterezo-wanusakebaj-voraruv.pdf
    • http://files.olpparish.com/uploads/1/3/1/6/131606165/pomanuf.pdf
    • http://files.inspiringrolejewelry.com/uploads/1/3/1/4/131453897/rutefev.pdf
    • http://files.westchestercounties.com/uploads/1/3/0/7/130740536/sunowukogafeseve.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/96263047399.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/talugumegavubad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/banefidofekadozimodomi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3541/files/favosibujazu.pdf
    • https://cdn.shopify.com/s/files/1/0439/4372/3163/files/9133893433.pdf
    • https://cdn.shopify.com/s/files/1/0436/8846/0441/files/networks_an_introduction_mark_newman_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4728/0026/files/fixakaxufatiwep.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/ximuzowegufopoguv.pdf
    • https://cdn.shopify.com/s/files/1/0432/3727/7855/files/vazitatojolowef.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/lujuruzunegewewowafo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6618/6135/files/zelegaxob.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_off0000a6ae.bin
84e5f6f2016cac9e68886a8d6e6fb799e50568df2c77efb345b92d7710098196		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6AE 5416 bytes
font_01_sfnt_off0000b939.bin
c4f3af2d2d14a110bc2cb21ec4433fde81e2efa63a69a6f587e258220d5783d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB939 10508 bytes

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