Malicious PDF — malware analysis report

Static analysis result for SHA-256 796a32313796777a…

MALICIOUS

PDF

37.4 KB Created: 2020-08-14 18:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7416999679895689120cf6abd86ad1e SHA-1: 9a9bfa899251d3f868463653cc4535789e4b800d SHA-256: 796a32313796777a986650cd6e3db3b0c45c4f62a51b6e91db7bf9c23c11ab8e
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent link, 'https://ttraff.ru/pify?keyword=cracked+strategy+games+apk', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'cracked strategy games apk' and the malicious URL, suggesting a lure to download potentially unwanted or malicious software. No scripts were extracted, but the presence of numerous links and the identified malicious redirector indicate a phishing or malware distribution attempt.

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=cracked+strategy+games+apk
    • http://files.apsexplore.com/uploads/1/3/1/8/131858916/vifipukewanikusas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/nios_assignment_page_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6678/files/borges_que_es_el_budismo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4311/8495/files/webekutumozerukojuxupa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7207/files/46402609938.pdf
    • https://cdn.shopify.com/s/files/1/0433/8185/0268/files/4764519830.pdf
    • https://cdn.shopify.com/s/files/1/0435/2429/2762/files/cbse_board_exam_date_sheet_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/academic_year_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0437/6798/8376/files/26624263470.pdf
    • https://cdn.shopify.com/s/files/1/0429/0261/8278/files/68914412253.pdf
    • https://cdn.shopify.com/s/files/1/0439/8268/4318/files/84770167159.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/koxumugude.pdf
    • https://cdn.shopify.com/s/files/1/0437/1641/1547/files/taxosedajaba.pdf
    • https://cdn.shopify.com/s/files/1/0435/3402/4855/files/motor_insurance_policy_wording.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b1f.bin
21a0d6cad3589a52f60e9cf5befc677d571a5b6129126b9dcf91311bde1cfe02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B1F 5432 bytes
font_01_sfnt_off00005d88.bin
f2c424c3ea7c057bf072b40cb202d727b9143415ec21222ba1f5bad572b6dec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D88 14212 bytes

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