Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f94dba13ce5b2a6…

MALICIOUS

PDF

47.7 KB Created: 2020-08-14 00:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6f1fffd7829b93fdf647abe64119430 SHA-1: f4c34021686933c956d926231f10a1d703f1c6e7 SHA-256: 7f94dba13ce5b2a661979c13b5123be3d5d819ea8b4d46c7c9736ac0e7aceb72
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL, indicating its intent to redirect the user to malicious content. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest a phishing or malicious redirection attempt.

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.ru/pify?keyword=busan+korea+weather+report
    • http://fixenul.kurskeducation.org/uploads/1/3/1/4/131438641/xoxenaweridopixov.pdf
    • http://files.crossdepot.net/uploads/1/3/1/0/131070151/50f5b5c18998.pdf
    • http://files.flockofbirdsmosaics.org/uploads/1/3/0/9/130969356/vatalogowu_zogidinu_pabugepedif_libuvuzozexesat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/faxusumowavunisipor.pdf
    • https://cdn.shopify.com/s/files/1/0437/8234/0770/files/benazoxoziwunazob.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5745/files/arduino_servo_motor_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/9570/3204/files/23205874754.pdf
    • https://cdn.shopify.com/s/files/1/0429/8414/5049/files/chief_keef_zero_to_250.pdf
    • https://cdn.shopify.com/s/files/1/0432/2036/9567/files/doena_de_chagas_sintomas.pdf
    • https://cdn.shopify.com/s/files/1/0433/2489/9496/files/11136926835.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/zojosujefosozojup.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6807/files/97699810845.pdf
    • https://cdn.shopify.com/s/files/1/0440/0313/1542/files/mititanujerojokaguwixukot.pdf
    • https://cdn.shopify.com/s/files/1/0439/5663/3758/files/photoshop_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0437/0019/1387/files/crystalline_and_amorphous_materials.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_off00007d4c.bin
06de737a0b37ca5d11a592a95a121113d9e850e966d4ca372f37bc106b48b9e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4C 5080 bytes
font_01_sfnt_off00008e9e.bin
fd39aabb43c4eb01ddda7074672c5060ef672d00e19c2114ac74b5fd3901a979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9E 10452 bytes

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