Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62759420e13ac54…

MALICIOUS

PDF

46.3 KB Created: 2020-08-31 21:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f95696a35d5b305eaf547a3c7dc16f6e SHA-1: 6610cf2ad237e4b8739a5007119c3784685f8393 SHA-256: a62759420e13ac5476f8d206440420a220ad92f9b231f34d1c795652f6122d5f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and a Shopify URL, suggesting these are central to the lure.

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.cc/pify?keyword=chupana+bhi+nahi+aata+song++raagsong
    • https://cdn.shopify.com/s/files/1/0433/5190/0310/files/27142885812.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/kawenaletuxifevukeke.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/aplasia_medular_en_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7287/files/artificial_intelligence_and_machine_learning.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/43685333204.pdf
    • https://static.usrfiles.com/ugd/02beb7_be6083e9f7104eba9378f5d54e5be4dc.pdf
    • https://static.usrfiles.com/ugd/6908d7_668156f318004eba90c5c7f33dfac90f.pdf
    • https://static.usrfiles.com/ugd/b8c837_45dcab2377b64da098b61069f1516db4.pdf
    • https://static.usrfiles.com/ugd/856cea_930f3864672b46b4a51d025a9c033a6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_41e091a9e74441d1ab7d59b58a3b6bc5.pdf
    • https://cdn.shopify.com/s/files/1/0437/0916/9815/files/jakoxowetabewovizaki.pdf
    • https://cdn.shopify.com/s/files/1/0427/9851/4343/files/motonezaf.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_off000065df.bin
2a52a07c659df0ea897c6121a6ff2e90aefc7b92dd1e172b8e6574f3bb825a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x65DF 5096 bytes
font_01_sfnt_off0000771f.bin
94f3262e3dec1334939c4df38b69208c1698ff175cd00c725e084f306f1d998e
pdf-font-stream PDF embedded font (sfnt) at offset 0x771F 16848 bytes