Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bbbbd0c9c11ff6…

MALICIOUS

PDF

45.9 KB Created: 2020-07-28 12:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 180d67ae2bef28ff7b9ffcc508782cef SHA-1: 018f88501e9acad950cca8ae0a7f7f4ce7db79ab SHA-256: 28bbbbd0c9c11ff69f8b4128a617b9fa4aabdfa23a1f5077f5bc5b72f370255e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=chhota+bheem+cartoon++hd+mp4'. Additionally, a PDF SEO link farm heuristic indicates the presence of numerous external links, with one example being 'https://cdn.shopify.com/s/files/1/0429/3020/8924/files/78220702009.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the lure content and the wkhtmltopdf tool, suggesting a document generated for malicious redirection.

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=chhota+bheem+cartoon++hd+mp4
    • http://files.bibleverseshelp.com/uploads/1/3/1/4/131438113/popafav-gujobazofof-pupewe.pdf
    • http://files.montessoriassothailand.org/uploads/1/3/1/6/131606133/kugovipetanazu_tapiru_dediteminogud.pdf
    • http://files.onyxfgallery.com/uploads/1/3/0/7/130738701/zadodawuperurajuguf.pdf
    • http://files.anvilcityscienceacademy.org/uploads/1/3/1/4/131437878/tozevogageru.pdf
    • http://files.bibleverseshelp.com/uploads/1
    • https://cdn.shopify.com/s/files/1/0429/3020/8924/files/78220702009.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/9771058501.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/merubafigejeri.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/52556787425.pdf
    • https://cdn.shopify.com/s/files/1/0430/4040/7701/files/wasifezigizuwad.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/xuwipi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8953/4869/files/suwupefefa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/juremepubinuju.pdf
    • https://cdn.shopify.com/s/files/1/0429/0982/7231/files/65538249041.pdf
    • https://cdn.shopify.com/s/files/1/0434/9476/8792/files/6008205451.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/71581859256.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/fezibonewol.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/ganuxigenujipexid.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_off00005f91.bin
7f7ba997d3b447e5413f7f034fdff5cca7a68586a47f3f3e3ce6811c76c50336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F91 5096 bytes
font_01_sfnt_off000070b8.bin
68c9dfe60181968f62399b0e51b67230d6e33d822e17b9755465b800919c6bab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B8 10532 bytes
font_02_sfnt_off000094f6.bin
5698acbdcff49472a9cdd2a8b3ede21a68e35b6eb3e80e5a4dd826820abf4826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94F6 16252 bytes

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