Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca831492eb613f81…

MALICIOUS

PDF

45.1 KB Created: 2020-08-20 07:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0969dea6d3c8440592fde8ac74677181 SHA-1: fb6adba3b558fbbe36581fba650f42a971a10c48 SHA-256: ca831492eb613f81b2aa599debf7269529ddabbbf5966fdd1977f72a6f3e650d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=death+valley+off+road+guide', is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a 'Death valley off road guide' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=death+valley+off+road+guide
    • http://files.insideoutoutdoors.com/uploads/1/3/0/7/130738915/57ecf77b3d47.pdf
    • https://cdn.shopify.co
    • https://cdn.shopify.com/s/files/1/0451/1550/6853/files/dojutased.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78108387577.pdf
    • https://cdn.shopify.com/s/files/1/0432/6398/3769/files/joe_cocker_feelin_alright_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0436/9186/8313/files/6126765780.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/puxoved.pdf
    • https://cdn.shopify.com/s/files/1/0429/6520/5141/files/fagexupuxosopupixeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/48465682301.pdf
    • https://cdn.shopify.com/s/files/1/0429/4246/4163/files/lefixomululinegidot.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9097/files/concept_of_human_development.pdf
    • https://cdn.shopify.com/s/files/1/0450/2981/8532/files/eye_of_azshara_boss_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/lafokoletofiwuf.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007389.bin
c33a4558f82625718f81bfd465c497c414ea949c66667423f5e254ae3b030ff6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7389 5152 bytes
font_01_sfnt_off00008520.bin
36debcd743b47cad73746a76a4e8fb2e1e63f7facdea0ee2e5a92d0b2d04289d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8520 9996 bytes