Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38d70fb7ea761d5…

MALICIOUS

PDF

42.1 KB Created: 2020-08-12 09:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ae9d703769206e29c776e870a8f2c53 SHA-1: 73b6279685b6749cfd610322551c9df173ac3428 SHA-256: e38d70fb7ea761d519834afc40db7014ffe26638bf7458673fd47e435d6c2774
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which are part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=how+to+castrate+a+pig+pdf', which is likely used to redirect users to malicious content. The presence of numerous benign-looking Shopify links alongside the malicious redirector suggests an attempt to obscure the malicious intent.

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=how+to+castrate+a+pig+pdf
    • http://files.meyerbrothersletters.com/uploads/1/3/2/7/132740951/sarubosivikumorawuba.pdf
    • http://files.karaadditonphotography.com/uploads/1/3/1/4/131406610/3139614.pdf
    • http://berovopo.elementalstonetherapies.com/uploads/1/3/1/4/131407995/fanuwekapovora_dumanarop.pdf
    • http://files.theshak.com.au/uploads/1/3/2/6/132681308/2522670.pdf
    • http://files.r2wnt.com/uploads/1/3/2/6/132682883/6507232.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/uakron_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/2819/3184/files/63435294987.pdf
    • https://cdn.shopify.com/s/files/1/0433/7057/8070/files/77872473331.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/isc2_ccsp_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/6205/9427/files/477710312.pdf
    • https://cdn.shopify.com/s/files/1/0437/4023/3880/files/biological_classification_questions_for_neet.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6488/files/suvesemobagesogefero.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4634/files/vobamajifupe.pdf
    • https://cdn.shopify.com/s/files/1/0429/0881/1427/files/81220975214.pdf
    • https://cdn.shopify.com/s/files/1/0440/7332/0613/files/aligarh_movement_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/jegufuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/cezar_roberto_bitencourt_codigo_penal_comentado.pdf
    • https://cdn.shopify.com/s/files/1/0430/6108/4314/files/16134242678.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_off0000663c.bin
0e5ebb72dc1a36cd7e69304778a7915826dfc9b7406f9dc15382402b7126cc10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663C 5344 bytes
font_01_sfnt_off00007888.bin
053643aa16f9e651abdf476e6ffc6c4f44ff4d646478bdb4c7192e91529cc58f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7888 10208 bytes

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