Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10fb7eed9995d50…

MALICIOUS

PDF

50.8 KB Created: 2020-08-09 09:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 150867c1502366f43fcbe249dabdcfd0 SHA-1: 6d5af7968817c2386e995615c7df21a5ffc7ea7c SHA-256: a10fb7eed9995d5057a73dc28ef4eca5c24d9085c0d5c1a18d0dae171fb32313
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 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and text suggesting a lure for a free PDF download. The presence of numerous external links, many pointing to Shopify, further indicates a link farm SEO tactic to attract victims. 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=antenna+handbook+theory+applications+and+design+pdf+free+download
    • http://files.serenitywholisticliving.com/uploads/1/3/1/3/131397955/widavajumibu.pdf
    • http://xatag.solutionsforenergy.co.uk/uploads/1/3/1/3/131398455/vewokowixogi.pdf
    • http://betox.johnmallonhistoricalnovelist.com/uploads/1/3/1/0/131070420/9115216.pdf
    • http://files.eccpoplar.com/uploads/1/3/0/8/130813732/nerulum.pdf
    • https://cdn.shopify.com/s/files/1/0437/5832/1821/files/25899679133.pdf
    • https://cdn.shopify.com/s/files/1/0431/0591/0933/files/bugewakesininebirebuposi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5650/3704/files/wifotamobomexutisutularix.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/35497314021.pdf
    • https://cdn.shopify.com/s/files/1/0432/7525/5972/files/40406763311.pdf
    • https://cdn.shopify.com/s/files/1/0437/8168/5406/files/37247009432.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/vusafag.pdf
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/32990585251.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/dark_souls_2_item_ids.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/7880192973.pdf
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/xitexipevubisif.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8298/files/tevukipabaxuvuto.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_off00006e17.bin
183862c3af233652ed2f22b2e36fad2fbf75a6e221a46a14f3f3757c882fd3f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E17 5804 bytes
font_01_sfnt_off000081e7.bin
0f2648bb22772c58fe3fa98005c79fc07295894d7c7582183607480490f7b8bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E7 10512 bytes
font_02_sfnt_off0000a60f.bin
cc4dcf9b3f20d6ee28823ee0c936756282ca457d240c648fb056104074dd32c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA60F 16836 bytes

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