Malicious PDF — malware analysis report

Static analysis result for SHA-256 178a5fff7d865459…

MALICIOUS

PDF

52.9 KB Created: 2020-08-20 13:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a10b778b92d25175da762666a522518e SHA-1: 4fa20172d7ab01c39ba99b0c27d5792e886c17e1 SHA-256: 178a5fff7d865459cab203b45c1eee2e33ca53f683a8026b88b26af08e7bacc9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to direct users to malicious content. No scripts were extracted, but the presence of numerous links and the redirector heuristic strongly suggest a malicious intent, likely to lead users to phishing or malware download sites.

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=baby+shark+piano+sheet+music+boss
    • http://files.evergreenpark1171.org/uploads/1/3/0/7/130775222/duxepogivopu.pdf
    • http://files.minniemightietopics.com/uploads/1/3/1/0/131070786/8027942.pdf
    • http://mugukisa.yottaearthhome.com/uploads/1/3/2/8/132814097/zukukuwavasow.pdf
    • http://nolupatax.northchesternews.com/uploads/1/3/1/4/131406717/8834888.pdf
    • http://sofam.strengthsdevelopment.com/uploads/1/3/0/8/130814411/5b2c33d88bc36.pdf
    • https://mnot.es/2xsq39X
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/9614/6074/files/electronic_amplifier_circuits_theory_and_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/4898/3959/files/volume_spread_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/certificate_of_origin_form_a_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0440/5847/6694/files/god_of_war_betrayal.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/gegasirigepebede.pdf
    • https://cdn.shopify.com/s/files/1/0433/7483/7925/files/65051989157.pdf
    • https://cdn.shopify.com/s/files/1/0446/3457/0915/files/lasaraguben.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/http_post_file_multipart_form-_data.pdf
    • https://cdn.shopify.com/s/files/1/0429/3338/7423/files/cub_cadet_lt1050_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5757/files/sql_developer_resume_2_years_experience.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006344.bin
2ed8a1678196248277d943db2e159f60849ca4b57526cb5e12d498e981a2f866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6344 5376 bytes
font_01_sfnt_off00007559.bin
2398f6860b6d4ad70351dcd86309319f8c7b2b241d7a203d4d8007d5cdfd3871		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7559 14192 bytes
font_02_sfnt_off0000a1a6.bin
d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1A6 16060 bytes
font_03_sfnt_off0000b63b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB63B 4324 bytes

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