Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f59a689929462a6…

MALICIOUS

PDF

52.5 KB Created: 2020-09-05 03:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb24fed538d199a1c0a7960e4acbaccf SHA-1: ed4ef38a5ef7933827487ee1d27a27fa66a47625 SHA-256: 2f59a689929462a6b94ae97b34eda31b2733383e2f3b2ec4db5428885e423457
152 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.link, which is likely used to obscure the final destination. The document body and embedded links suggest a lure related to educational content, specifically 'sslc chemistry model questions and answers', to entice users to click the malicious link. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking and distribute malicious content.

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.link/wix?keyword=sslc+chemistry+model+questions+and+answers
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/1781218002.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/72326965896.pdf
    • https://cdn.shopify.com/s/files/1/0465/0362/4856/files/easyjet_air_hostess_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0461/9478/6467/files/soundtrack_angklung_preman_pensiun.pdf
    • https://cdn.shopify.com/s/files/1/0437/8266/8437/files/finova.pdf
    • https://static.usrfiles.com/ugd/b6edda_db64022c06a6413a8b32e7e355950c94.pdf
    • https://static.usrfiles.com/ugd/a98ecc_611fd128fcae425386f43b4feedc5803.pdf
    • https://static.usrfiles.com/ugd/3bcfef_f07f5a78b45f437f8bf4b7c871e8ebd0.pdf
    • https://static.usrfiles.com/ugd/aff7ca_5f31cb6d2c4d42e3929f3edcb241df8d.pdf
    • https://static.usrfiles.com/ugd/3402b1_bfba4afb0e1741c5bf715de2b23eb086.pdf
    • https://static.usrfiles.com/ugd/9a242c_ef0dab4d665a49a0970ac60e31164213.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7243/files/60820352156.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/wulisimuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/3246/8890/files/sonibowakosatexoxo.pdf
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/jijoxamejotinuzirenexopi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006727.bin
85527c8d5646bc857294ddf9cff85baa9c5c0f45e41ec57c78184cd0dfd05b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6727 5600 bytes
font_01_sfnt_off00007a07.bin
b8cd423528ae407a685a3d4dafaa793dd6d1ac65838288fcd3a8dfc80ca437c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A07 4128 bytes
font_02_sfnt_off00008991.bin
003f1d53a163521daff2fc38c615436437a5457b50011093fe41278c21a261db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8991 10360 bytes
font_03_sfnt_off0000ad0a.bin
4ef78eb9705f3c2c343eb52bc19096c70c1c40155d8968c9cc9675522f808f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0A 16200 bytes

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