Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55164aba8529004…

MALICIOUS

PDF

41.2 KB Created: 2020-08-11 19:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 275887937b9f259399951ec707711bcd SHA-1: 82be03ab823418c821f6a954237ecb90e55fd982 SHA-256: b55164aba8529004d8ed63e32acc5c88f3f346366ab13675ae00fd233592941a
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an application form for an OBC caste certificate. The document body and heuristics indicate a link farm strategy, with numerous embedded URLs pointing to various PDF files, likely to manipulate search engine results or distribute further malicious content. The primary malicious URL is https://ttraff.ru/pify?keyword=obc+caste+certificate+application+form+pdf, which is flagged as a known malicious redirector.

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=obc+caste+certificate+application+form+pdf
    • http://files.lowellstudentassociation.org/uploads/1/3/2/7/132740892/mesejagab_rizirejukezesa_daperem_riwek.pdf
    • http://tuwenizug.thehoneybeefactory.net/uploads/1/3/0/8/130813821/nexopineputo_gabinitisemor.pdf
    • http://files.kinnorclassics.com/uploads/1/3/1/0/131071063/4343608.pdf
    • http://dosozebu.affordabletherapytoronto.com/uploads/1/3/2/6/132696414/fekujavene-lonozupigokotib-bimawomunozax.pdf
    • http://www.anagrasarkalyan
    • https://cdn.shopify.com/s/files/1/0433/5029/4678/files/adobe_edge_animate_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/8619/2546/files/buwumubamopapale.pdf
    • https://cdn.shopify.com/s/files/1/0437/5828/9045/files/bessel_s_inequality.pdf
    • https://cdn.shopify.com/s/files/1/0434/1415/9521/files/79795390470.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5878/files/cdi_pocket_guide_2015.pdf
    • https://cdn.shopify.com/s/files/1/0437/3767/7989/files/49430506817.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5094/files/bengali_calendar_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0087/files/84601065859.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6334/files/18796535684.pdf
    • https://cdn.shopify.com/s/files/1/0433/7519/8373/files/division_of_polynomials_examples_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/8438/1337/files/pezinod.pdf
    • https://cdn.shopify.com/s/files/1/0435/2950/2874/files/zuvuwajuvegidatoluposo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6633/4111/files/39175720253.pdf
    • https://cdn.shopify.com/s/files/1/0438/7789/2251/files/29942525353.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_off00006389.bin
ff0973e50fb3f20b46ea6130cac16a663f83c80d2570242962d8789f76c913a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6389 5468 bytes
font_01_sfnt_off000075f3.bin
18c661f0ff60eacc8c89b8c6ef80f98ae59aeade04c03dab9f73d4ab2badbd24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F3 9748 bytes

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