Malicious PDF — malware analysis report

Static analysis result for SHA-256 212748e791387222…

MALICIOUS

PDF

37.4 KB Created: 2020-08-15 15:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f755557bf92c78b192fe87799fc2679 SHA-1: 3aab87e77ec46c006579570209496a6c658baa0c SHA-256: 212748e791387222327e978a5d0819f5b72ad6f0546784a35806141b61edcd68
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to suspicious domains, designed to redirect users to malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to traff.ru, a known redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated but contains the URL https://ttraff.ru/wb?keyword=general%20science%20questions%20and%20answers%20pdf%20in%20tamil, further supporting the redirection attack pattern.

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=general%20science%20questions%20and%20answers%20pdf%20in%20tamil
    • http://zisav.davidjonesdialogues.com/uploads/1/3/0/7/130738731/597c38.pdf
    • http://files.thehighlanderreport.com/uploads/1/3/2/6/132695492/8949114.pdf
    • http://files.windycreek1910.com/uploads/1/3/0/7/130740138/wavirerojulu_pafumatolire_nedokafad.pdf
    • http://files.migueljuliobeauty.com/uploads/1/3/2/6/132681647/rivolosekatesuxozibo.pdf
    • http://files.nyacrossphotography.net/uploads/1/3/0/7/130776069/lajuzitimaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0735/files/kobexiwibokogo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1014/6983/files/14378655905.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/bebare.pdf
    • https://cdn.shopify.com/s/files/1/0434/2808/5911/files/auferstanden_aus_ruinen_noten.pdf
    • https://cdn.shopify.com/s/files/1/0435/6970/9217/files/nuwepiwemi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/83367014795.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/dureraru.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/letidexulewatogaxadimom.pdf
    • https://cdn.shopify.com/s/files/1/0437/8342/2109/files/15240656958.pdf
    • https://cdn.shopify.com/s/files/1/0433/6510/5814/files/company_profile_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0428/3292/0739/files/ntp_servers_us.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_off00005419.bin
835a044169da89d04731f653839ecf5e40f94c6e886d3fb22b94532fe33c6ca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5419 5548 bytes
font_01_sfnt_off000066f8.bin
b2b2fbdc2ac833ca9827bd1dec65b09b62ce22f859707e9217f2e83036d61b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F8 9888 bytes

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