Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e3c26291297526…

MALICIOUS

PDF

45.5 KB Created: 2020-08-09 04:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af077aaa412803f4c3827b1c28a4c8bb SHA-1: b630ae57aad34f92eebf622a45b886377316b026 SHA-256: 65e3c26291297526deabeadc1c95431cdbe776818b33771cdd413875b09d3985
154 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that redirect to malicious infrastructure, specifically a redirector at 'ttraff.ru' which is associated with malicious activity. The document body, though heavily obfuscated, contains text suggesting it is a lure for free download materials, likely to trick users into clicking malicious links. The presence of numerous external PDF links, many pointing to benign Shopify domains, suggests a link farm used to obscure the 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=english+speaking+course+material+pdf+free+download
    • http://koxubuk.sybilgotsch.com/uploads/1/3/2/3/132303382/jowokajavupup-zomide.pdf
    • http://files.sleekbodyonline.com/uploads/1/3/2/3/132302819/f167c0263a4.pdf
    • http://files.preferred-personnel.com/uploads/1/3/1/8/131871625/mufomezuxuluk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/job_interview_preparation.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/xilavowofixil.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/36373172881.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevimofurerofujasopam.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/88421484990.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/western_union_online_transfer.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/20566699725.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8661/files/54224393918.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9917/files/effects_of_colonialism_in_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3617/1688/files/dictionnaire_franais.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/29270945231.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005581.bin
a308d9f23807c8b19ff8d6ad01b96f82e8b22cf3118960bad08614252e8442cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5581 5680 bytes
font_01_sfnt_off000068c2.bin
0021346b3d4ade794b48569e50b1853c0a7d02eea63a2aeb756c7440453fd7aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C2 10084 bytes
font_02_sfnt_off00008b93.bin
7ec081d46582341cea282e64bdf1ff2d24ea2a7a1bf0cfb8eb0c578230692d02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B93 18692 bytes

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