Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df9ea52c7fdf697…

MALICIOUS

PDF

66.5 KB Created: 2020-08-04 16:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7023f1e920fcc01fcebfa81f488ff51 SHA-1: c70e613eb98ce8cc35da2d36cf964fb48c03cdd2 SHA-256: 2df9ea52c7fdf6973e0654e4a856d7c86c7a4c53e08f9bc85bc394f04deecefe
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=typhoid+fever+journal+pdf+2020', suggesting a lure to download further malicious content or redirect to a phishing page. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=typhoid+fever+journal+pdf+2020
    • http://files.autismbuddies.org/uploads/1/3/1/4/131438216/575881.pdf
    • http://nurux.semindigenousmusic.com/uploads/1/3/1/8/131857315/pewuduzop.pdf
    • http://files.madisonrosefund.com/uploads/1/3/2/6/132683181/xavususetas-vasefisidu-tosup.pdf
    • http://files.arc-hcs.com/uploads/1/3/1/4/131455158/dazefabugepajav.pdf
    • https://cdn.shopify.com/s/files/1/0434/0383/7591/files/zuvejofewon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65788935473.pdf
    • https://cdn.shopify.com/s/files/1/0434/7196/2265/files/airmen_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/40393158501.pdf
    • https://cdn.shopify.com/s/files/1/0430/5541/5445/files/woxuta.pdf
    • https://cdn.shopify.com/s/files/1/0435/3658/0757/files/2043550639.pdf
    • https://cdn.shopify.com/s/files/1/0432/9468/7400/files/14175974906.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/5337927077.pdf
    • https://cdn.shopify.com/s/files/1/0428/5349/9046/files/78660277682.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/89791599984.pdf
    • https://cdn.shopify.com/s/files/1/0435/4624/7332/files/68742097456.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b898.bin
dc76fc2a567574547b21e19d5358cf29f1aafe0b31ebbbbf49bb82d14b7d8c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB898 5216 bytes
font_01_sfnt_off0000ca53.bin
bb6069aa96b77b319b4727b077bdb93b6d4a4d314ab6597f6d5342e8ef88caae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA53 10840 bytes
font_02_sfnt_off0000eed5.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 4324 bytes

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