Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4940659c71ee34a…

MALICIOUS

PDF

43.4 KB Created: 2020-08-06 17:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 273ded5cc3cbdc291f1574feb9e4d2f4 SHA-1: 739d75f546e8e06dd3139a890473135342d112c1 SHA-256: b4940659c71ee34a10f7e64456130a2f906ef5762614d69ac39b29879cabbcaa
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a Comcast Xfinity channel lineup. The document body, though heavily obfuscated, contains this URL and numerous other links to PDF files hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious lures. The ML classifier strongly supports the malicious nature of this PDF.

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=comcast+xfinity+channel+lineup+pdf
    • http://files.inscience242.com/uploads/1/3/1/4/131406558/fijiv.pdf
    • http://files.lmocinc.com/uploads/1/3/1/6/131606003/lamufe.pdf
    • http://files.eathorpepollherefords.com/uploads/1/3/0/7/130775023/774833a.pdf
    • http://files.meadrdmardigras.org/uploads/1/3/0/7/130739227/fa32f3.pdf
    • http://files.lknailsandbeauty.co.uk/uploads/1/3/2/6/132681938/wovaxale.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8411/files/75011980181.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/daxonufuzifimutewevezotal.pdf
    • https://cdn.shopify.com/s/files/1/0434/7189/6736/files/silent_letters_esl.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/fesibefuvidarumowetojug.pdf
    • https://cdn.shopify.com/s/files/1/0434/0380/4839/files/22326213155.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/15816453828.pdf
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/pokemon_world_map_editor.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/javatpoint_core_java_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/0735/0696/files/saxovedininulomisuwisur.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/furnace_stardew_valley.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/zoxemixenu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/lidigizopokelozakexinemu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/53058748388.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_off00006ac4.bin
491b7d2ec570fb565d2ed014130672f34220b7944d1da318dd26450966f4820a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC4 5376 bytes
font_01_sfnt_off00007cf5.bin
c7917dcc2a66cc226e0b2b21acaaade65fbefee50cf1480a5827729555d8638f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF5 10364 bytes

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