Malicious PDF — malware analysis report

Static analysis result for SHA-256 812be076866d79d1…

MALICIOUS

PDF

53.3 KB Created: 2020-08-12 11:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c783fb6cb042633d6a838aa9dbb33837 SHA-1: fdda953e163a426db2ab2ff0ae519fa2fb6b75df SHA-256: 812be076866d79d1864386741a40e559cc0d26c6eaf5fba0df18065951b35327
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination and potentially deliver a malicious payload. The document body itself contains garbled text but includes the same URL, suggesting an attempt to disguise its malicious nature. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm strategy to improve search engine ranking for the malicious URL.

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=kalnirnay+calendar+november+2020+marathi+pdf
    • http://files.rbsknowledge.com/uploads/1/3/2/6/132682070/jifilibosivasukud.pdf
    • http://files.milllakelodge.ca/uploads/1/3/2/6/132682335/9189494.pdf
    • http://files.survivinglogic.ca/uploads/1/3/0/7/130739601/8761311.pdf
    • http://files.acquiringenglish.com/uploads/1/3/0/7/130739836/68b00ed62dca.pdf
    • http://files.jessiejeanscafe.com/uploads/1/3/0/7/130739809/6447295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/1669/1612/files/28789278027.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6604/files/jaserojoxomegadufiv.pdf
    • https://cdn.shopify.com/s/files/1/0438/6222/9157/files/common_job_interview_questions_and_sample_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/vaselakunibabalatep.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5377/files/96843488957.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2629/files/96503109448.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/wolf_dress_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/2587/4600/files/37846584273.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/32232325868.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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006021.bin
20a0eaa9e6cd9bd073881e1e30a2f3d2a5068e8c17653f9f27e1e8f546b25e14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6021 5764 bytes
font_01_sfnt_off000073a1.bin
5c24e6c2311ea990627febc51c0404d52c26aee4e06f04403ca05cc62354a4da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A1 10180 bytes
font_02_sfnt_off000096a7.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96A7 16164 bytes
font_03_sfnt_off0000abfc.bin
f4adc561909068ae92f4abadf7c5480b515f3e5b3d1df4af9a34630aee7a14d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABFC 8052 bytes

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