Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d49da38b5d29e5…

MALICIOUS

PDF

47.1 KB Created: 2020-08-24 03:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3681c4ddef30e45e12caa09518c257e6 SHA-1: 900e1ac7cc3ab47b350aa0d2142c997fef5f0cc5 SHA-256: 06d49da38b5d29e5a55b0703f8218c1cd97e6d6deb5f8cc7530792b970a6a8d3
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 external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used to obscure the final destination. The document body, though heavily obfuscated, contains the same malicious URL and references to converting fractions into decimals, likely a lure to encourage clicks.

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=converting+fractions+into+decimals+answers
    • http://files.asadeltanu.org/uploads/1/3/1/3/131384429/1435233.pdf
    • http://files.seasonalshowers.com/uploads/1/3/0/7/130775145/varubebun-wimitudelejoba.pdf
    • http://files.5809yoga.com/uploads/1/3/1/4/131437669/kezivifa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0632/7959/files/89038981573.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/yamaha_v_star_650_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevaziretojigadogikoranab.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/bakadidurunudokusola.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0739/files/9474471453.pdf
    • https://cdn.shopify.com/s/files/1/0466/7460/8293/files/xoxijipujiwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/87934934435.pdf
    • https://cdn.shopify.com/s/files/1/0437/0120/7193/files/wojelowufukitiwewe.pdf
    • https://cdn.shopify.com/s/files/1/0429/4633/0791/files/45840190545.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/dulapixeni.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4727/files/us_army_song_lyrics.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006176.bin
48ae722b54606d055527a4eb436cf2fe3e17a7888e306acb7c83a40e17ef771f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6176 5400 bytes
font_01_sfnt_off000073d1.bin
11c8369572fe16e1c2ccaa5796d050a4ed9a6dee0124f78a7fe86c264647adf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D1 10712 bytes
font_02_sfnt_off000098a2.bin
84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A2 16060 bytes

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