Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77a65a8d0d556b6…

MALICIOUS

PDF

39.3 KB Created: 2020-08-19 08:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19b43230b11a8c7642ccf24e17fca2cc SHA-1: b61667bc24433664b5c231eab9dc5c1a1f3c2e4d SHA-256: e77a65a8d0d556b6ae9dc2a153dc2a0a94a62c042d72c301fa2dcc93618963a8
152 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier as malicious. It contains a large number of embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The document appears to be a link farm, likely designed to lure users into clicking through to potentially harmful sites. No scripts were extracted from this sample.

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=sko+barn+st%25C3%25B8rrelsesguide
    • http://jajitegaz.ruleof5.com/uploads/1/3/1/8/131857631/b761e36.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zizamazigunonafimav.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/dabudokapulatizixek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zaduvezumutup.pdf
    • https://cdn.shopify.com/s/files/1/0436/4831/9638/files/terumepelivowife.pdf
    • https://cdn.shopify.com/s/files/1/0440/4042/1541/files/chief_keef_song_downloads.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/budifatorek.pdf
    • https://cdn.shopify.com/s/files/1/0431/4487/2085/files/he_s_going_the_distance_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/78650841932.pdf
    • https://cdn.shopify.com/s/files/1/0432/3131/4077/files/nuvekajotor.pdf
    • https://cdn.shopify.com/s/files/1/0431/3622/1341/files/puvavibirefuk.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_off00005a8e.bin
8371f8c1414e7074b441d5db174895ac5d17b902976d5c1100d9075c19129d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8E 5440 bytes
font_01_sfnt_off00006d07.bin
07d70ad659a4ae2920290c0f428fa308e18ed62005ac1ddf63dacb16c3798862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D07 9980 bytes

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