Malicious PDF — malware analysis report

Static analysis result for SHA-256 6585e2b4c7a5c1bf…

MALICIOUS

PDF

35.8 KB Created: 2020-09-03 04:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86bb18de9846383afffd78bb85ccd500 SHA-1: 3c588ecc99596e9d06c7f58a80c2671304340b8a SHA-256: 6585e2b4c7a5c1bf9ca1068932b8f30f02ba3bb18875e40fc69436a3a777605a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://ttraff.club/wix?keyword=bizzleberry+soraka+guide', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify links, indicating an attempt to drive traffic to malicious infrastructure. 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.club/wix?keyword=bizzleberry+soraka+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/2279/0305/files/signaling_theory_of_capital_structure.pdf
    • https://cdn.shopify.com/s/files/1/0434/4732/0728/files/64242570954.pdf
    • https://cdn.shopify.com/s/files/1/0433/3659/7663/files/2000_jeep_wrangler_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/2128/6050/files/nuzalibasikuwinedexetekiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/7749/1093/files/belt_conveyor_parts.pdf
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/zefokemaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/ziwemekusajuzerebupoxogub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0763/0747/files/estadistica_descriptiva_conceptos_basicos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53567737566.pdf
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/anandi_vastu_book_in_marathi_free_download.pdf
    • https://static.usrfiles.com/ugd/3e9e83_4f644747dbc24aac9ae9583781cbc154.pdf
    • https://static.usrfiles.com/ugd/18122d_25d9efc1069447c38cbdf0b4eac9a3b2.pdf
    • https://static.usrfiles.com/ugd/4dd980_1ee8cd714d4b494292b51e2ebe398f8c.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/durapek.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1988/files/current_immunization_schedule_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0462/6622/0695/files/mudokejoxobowebizomaruwug.pdf
    • https://cdn.shopify.com/s/files/1/0433/9620/2652/files/74123376117.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cc2.bin
1776ba525ec8634abd5608ad584746e0121da45f437e85a642cef8b0e239a25c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC2 5400 bytes
font_01_sfnt_off00005f40.bin
681382fb26d3e1fe44ed9b2bff712d2fbf5fa3eb42b38780113a77d89064ca2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F40 10300 bytes

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