Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5a84356504e7f1…

MALICIOUS

PDF

39.3 KB Created: 2020-08-31 18:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31b95f92c9c4369e75123fb0d1c95091 SHA-1: a85b7ec6c8ccec13c3aadc6c4b6de2521db9833d SHA-256: 9d5a84356504e7f12fe6e29d4e444b9391b80ebe06a64a75f228bec7c9d82100
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=calma+remix+song++pagalworld.+com', which is also listed as a malicious redirector. The presence of numerous links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to 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.ru/wix?keyword=calma+remix+song++pagalworld.+com
    • https://cdn.shopify.com/s/files/1/0432/2364/6365/files/sharp_aquos_tv_usb_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/2594/7029/files/91694400658.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/56103968483.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/wowafubajiputew.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7640/files/sofodiwisi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9527/files/55801309682.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.pdf
    • https://cdn.shopify.com/s/files/1/0432/9652/2398/files/mastering_chemistry_answer_key_chapter_13.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/sirca_pneumatic_actuator.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/wopobetujolisadutarud.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0398/files/22440001411.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/43278630346.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/dojepefekabufeb.pdf
    • https://cdn.shopify.com/s/files/1/0451/3395/5225/files/zagaripe.pdf
    • https://cdn.shopify.com/s/files/1/0441/2211/2152/files/bharti_axa_life_insurance_policy_surrender_form.pdf
    • https://cdn.shopify.com/s/files/1/0463/6943/9899/files/reporting_accident_to_police_queensland.pdf
    • https://cdn.shopify.com/s/files/1/0432/3924/3931/files/belastingdienst_zorgtoeslag_formulier_aanvragen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d49.bin
06faa65b3e2207623e38aef1665836fc3bf272c7501a380640075f9e5fe36710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D49 5316 bytes
font_01_sfnt_off00005f56.bin
c491f6d82e482122be37b2f5b118106c88b836a2688d78ee3c2a2a39d554fcfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F56 10208 bytes
font_02_sfnt_off00008240.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8240 4324 bytes

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