Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f5ada13afbd749…

MALICIOUS

PDF

72.5 KB Created: 2020-08-14 23:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00c1b29c1f2d7a3d76f5f0397545dfd5 SHA-1: 969d891efa84348445120d533349f4192ab151a1 SHA-256: 77f5ada13afbd749a94f62f3bb196cd1acf1541779357ed495dfa349d57c6304
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One prominent link, however, directs to 'ttraff.ru', identified as a malicious redirector. The document body, though partially corrupted, contains the target URL, indicating an attempt to trick users into clicking malicious links under the guise of providing PDF content. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly suggest a phishing or redirection attack.

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=terjemah%20syarah%20hadits%20arbain%20pdf
    • http://files.experienceenso.com/uploads/1/3/1/3/131380894/muputugonavig.pdf
    • http://files.cobilconnect.com/uploads/1/3/0/9/130969853/6ea8d66a.pdf
    • http://mizotipu.oakcreekestados.com/uploads/1/3/1/6/131637881/kofuvaputepovumodax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/wella_koleston_color_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/54164940868.pdf
    • https://cdn.shopify.com/s/files/1/0432/6113/2968/files/84201165284.pdf
    • https://cdn.shopify.com/s/files/1/0437/4839/3112/files/cardiomiopatia_hipertrofica_felina.pdf
    • https://cdn.shopify.com/s/files/1/0428/5700/5215/files/51809612433.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/96925983315.pdf
    • https://cdn.shopify.com/s/files/1/0431/4316/8156/files/ca_medular_de_tiroides.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/mubixunexevinute.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9697/files/bobafixorosulobanefer.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000db81.bin
9b7ab08712a7415b1f012c8c50500b35fbc85979c8cc596c66d2bcb3e8e95572		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDB81 31172 bytes
font_00_sfnt_off0000a5af.bin
b9a74c4d6831d19e4111b087c82dee755d59c6ffdaafb32aac835afa871a3349		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5AF 5516 bytes
font_01_sfnt_off0000b851.bin
386154652e90364808f6818ba4e975853bf97eac1233320529d20ec5ea2bdba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB851 10216 bytes

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