Malicious PDF — malware analysis report

Static analysis result for SHA-256 415a7035c91aac1d…

MALICIOUS

PDF

40.9 KB Created: 2020-08-13 03:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11f9b1b7d8720f82e248eaa536b4373e SHA-1: 29bd801a4643ee71ed7dc5f6ae6c0af055ad4484 SHA-256: 415a7035c91aac1df1661d9f7134a8685ebfbee82824b5605b7d90dd5b036e0f
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is ttraff.ru, which is likely used to funnel victims to a malicious site. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF files.

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/wb?keyword=karl%20marx%20biography%20in%20telugu%20pdf
    • http://files.pallavisharma.com/uploads/1/3/1/4/131437554/1566594.pdf
    • http://files.elkhornvalleyhrc.com/uploads/1/3/0/8/130874612/8397628.pdf
    • http://files.milissweetstogo.com/uploads/1/3/0/7/130739614/7984546.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/jugof.pdf
    • https://cdn.shopify.com/s/files/1/0436/9950/3257/files/l_anatomie_de_la_main.pdf
    • https://cdn.shopify.com/s/files/1/0440/3340/9174/files/green_charge_managing_renewable_energy_in_smart_buildings.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/best_video_settings_for_csgo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4018/7303/files/52422234182.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8969/files/calculus_and_analytic_geometry_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/6262/2358/files/54114533694.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/witikidorubopexozuwuka.pdf
    • https://cdn.shopify.com/s/files/1/0438/0668/7389/files/cogs_analysis_orthodontics.pdf
    • https://cdn.shopify.com/s/files/1/0434/7537/0136/files/65542250920.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sitomomuwarusubewikujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/nivaldo_tro_chemistry_a_molecular_approach.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_off0000622f.bin
7b481f155cb89cf827e1707ee683a83c5732778b02ae5d696f6690f1b40d2df9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622F 5556 bytes
font_01_sfnt_off000074ff.bin
b605c73aabc1c59ef01eb8953b62a3b4b7402fe5c973493c3f61a25c1786fe2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FF 9876 bytes

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