Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2cbaa14ac573f7…

MALICIOUS

PDF

43.6 KB Created: 2020-08-08 02:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 135ac93818c92a88b126aefc0718b364 SHA-1: e82e0bd04df91a0ccc20a8f1fc24394f630785ff SHA-256: ca2cbaa14ac573f71ea27fe1a57b78c98c4c0f2585ec5d1103fe340e77eeb217
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. Another critical heuristic indicates the PDF acts as a link farm, hosting 28 external PDF links, many of which are hosted on 'cdn.shopify.com'. The document body contains garbled text but includes the same search query as the malicious redirector URL, suggesting a lure for search engine traffic.

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=word+meaning+in+urdu+pdf
    • http://files.godlylifelearningcenterinternationalministries.com/uploads/1/3/1/3/131398573/gomusolusu-kupanojerok-tegufevugijo-tebuwibavo.pdf
    • http://files.caveofpixels.com/uploads/1/3/0/8/130814254/1d9c6078ef633.pdf
    • http://files.callaoc8.com/uploads/1/3/1/6/131637224/206fab.pdf
    • http://files.foundersworkshophr.com/uploads/1/3/0/8/130874018/ee5619bb8ac8.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/98864683460.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/xetuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7073/files/kanor.pdf
    • https://cdn.shopify.com/s/files/1/0428/7502/7619/files/sopojapipafubopixubon.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6265/files/68746196756.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/service_catalogue_sample.pdf
    • https://cdn.shopify.com/s/files/1/0433/7801/6406/files/migujojizinutetiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3289/3857/files/walking_dead_s07e15_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/26599512432.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/8230952395.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
stream_005_off000080ee.bin
59d9b8a971d29c13d484c93ad37b99754faa9f067ac695fe934fb8174e58c19d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x80EE 19812 bytes
font_00_sfnt_off00004e6b.bin
37141f7f790ecb9221c473db75c0f814a3458bf5c25ab1400a75886f37adf50c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E6B 5164 bytes
font_01_sfnt_off00005ff3.bin
acf0a7832021c4bb4358c45676cc822f388276de5e7c34fb8ece60cba7bcc6bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF3 9608 bytes

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