Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e4f129e63bc537…

MALICIOUS

PDF

77.2 KB Created: 2020-07-24 13:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3257bef2d4ca099e46ed3ba50012a006 SHA-1: e8188b6f75c847cfa13adb1fd2377a9713a19333 SHA-256: 31e4f129e63bc537629d971c2f9016153cf3e8e661f5f827b98009a8a6c96b8d
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a PDF link farm. The primary malicious URL, 'https://ttraff.com/pify?keyword=portuguese+alphabet+pdf', is identified as a redirector. Many other links point to Shopify domains, suggesting a coordinated effort to host or distribute content. The ML classifier also strongly flagged this PDF as malicious.

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=portuguese+alphabet+pdf
    • http://files.pocketfriendlyonline.com/uploads/1/3/2/7/132712116/volixizun.pdf
    • http://files.gotericreativearts.com/uploads/1/3/0/7/130776254/kikopoker_xutovade.pdf
    • http://files.arhstyles.com/uploads/1/3/1/4/131438127/zesepefaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/92692157652.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/90724738777.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/xonorobavape.pdf
    • https://cdn.shopify.com/s/files/1/0431/2200/0029/files/xodulafaborikutavogolisu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8400/2981/files/42233385290.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/14349993785.pdf
    • https://cdn.shopify.com/s/files/1/0434/5934/6599/files/57976067064.pdf
    • https://cdn.shopify.com/s/files/1/0439/5565/0718/files/72521000549.pdf
    • https://cdn.shopify.com/s/files/1/0436/9914/2810/files/zodusovavirujupasatinavov.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/74716289505.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5676/files/vatepemalidaze.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/14777031166.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/wapubakazu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1330/6530/files/xejawegarawutujabin.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/80049420007.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_off0000e093.bin
76f6d046cc416b2f83aefcffee886c0a880611e23ce5e7f90698145bfc900d45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 5172 bytes
font_01_sfnt_off0000f23f.bin
82127c227c2c05bb57b855c44b5c71d2073335261a2377a89870c9ae2b049846		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 17956 bytes

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