Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b5ecd885dfe76a…

MALICIOUS

PDF

44.0 KB Created: 2020-08-06 21:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f53d6674b8ce2fc4357e69a7a2fa74cd SHA-1: ba53054f0b8c33ee48c7d81a1d166ed680416342 SHA-256: 52b5ecd885dfe76addd1c3d48642336d45162664a6739a953c6c1487490999a7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a known malicious redirector domain (ttraff.com). The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and numerous other URLs hosted on Shopify, likely as part of a link farm to improve search engine ranking for malicious content.

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=hernia+umbilical+recidivada+pdf
    • http://files.shankarbaba.com/uploads/1/3/1/3/131398010/tewovakim-nuximafisaguf-dabakikalunodob.pdf
    • http://files.icreatelighting.com/uploads/1/3/1/4/131452949/pibomafepon.pdf
    • http://files.unathemermaid.com/uploads/1/3/1/6/131606487/lafubibam.pdf
    • http://files.moparsunlimited.net/uploads/1/3/1/4/131483108/6eab07c7f7dbca.pdf
    • http://files.francisxtobin-prresume.com/uploads/1/3/1/3/131381602/vabirudupagepazevu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2445/files/31644095147.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/cite_youtube_video_chicago.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/gipexuvarubemizi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/96131004368.pdf
    • https://cdn.shopify.com/s/files/1/0444/4497/5271/files/auditory_pathway.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/fikinililuvasubodiwiba.pdf
    • https://cdn.shopify.com/s/files/1/0435/9107/3947/files/94984681673.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/mathematical_methods_for_economics_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/51893787139.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/77880270929.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1077/files/8964204897.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/mikufosuzigitoro.pdf
    • https://cdn.shopify.com/s/files/1/0437/8745/2576/files/60329234073.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_off00006f53.bin
81db6e6ec07d0c41c7265780586c8d39ac184ba4a5538a04fdfdb0b6a814fc62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F53 5284 bytes
font_01_sfnt_off00008135.bin
562f6cf8c828926a11814bb603784ae14be079b972ea401cb7a005cdc2edc6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8135 9956 bytes

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