Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d95dae9bf91004b…

MALICIOUS

PDF

55.2 KB Created: 2020-08-18 13:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f38bb5859d182b4c328eaf014ef876c8 SHA-1: da463972fb46d528c59884cfe63cf359b1a8f7c9 SHA-256: 5d95dae9bf91004b059a7b93da944d55529b752d0120ec675779662f80f89c63
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. The primary malicious URL identified is ttraff.ru, which is associated with malicious redirector infrastructure. The document body, though heavily obfuscated, contains the malicious URL and keywords suggesting a lure for a free dictionary app, likely to entice clicks on the embedded links.

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=french+dictionary+app+android+free
    • http://nakuw.kashmirgoldens.com/uploads/1/3/1/3/131398140/3388657.pdf
    • http://wimesol.sevenstarsamerica.org/uploads/1/3/1/4/131483281/dddf5f1acc6e310.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0560/7079/files/for_loop_factorial_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0435/3556/4964/files/47153726129.pdf
    • https://cdn.shopify.com/s/files/1/0431/1311/9905/files/tixoralur.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/teviregozokudowos.pdf
    • https://cdn.shopify.com/s/files/1/0437/3279/5541/files/pong_python_code.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5032/files/itunes_country_codes.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/1554827755.pdf
    • https://cdn.shopify.com/s/files/1/0432/6398/3769/files/tuzudakelubus.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/77805065452.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e41.bin
736283d7525af2936175bde0c2e0675243c64f649cabb84fbbbfc3e9347d4d97
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E41 4880 bytes
font_01_sfnt_off00009ec7.bin
6ed80a9f71d699976737a4aa3b418db95ae84107d990ec58e7a9c04edbfe1361
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC7 10184 bytes
font_02_sfnt_off0000c187.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xC187 4324 bytes