Malicious PDF — malware analysis report

Static analysis result for SHA-256 25337a3515474f1e…

MALICIOUS

PDF

45.0 KB Created: 2020-08-18 15:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7c1ad91eed9a928ebd4708cf3fc5fb4 SHA-1: 094539f99811d0d4157de5d7f5fd3a0faf740402 SHA-256: 25337a3515474f1e2f359596a3778f60e2e6b8d6ced64f54d480c9011c52341d
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.com'. The document body, though heavily obfuscated, also contains this URL. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click the malicious link, likely leading to further compromise.

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=2018+calendar+with+holidays+philippines+pdf
    • http://files.rootsfamilycollaborative.com/uploads/1/3/1/4/131438692/66616da4a2.pdf
    • http://zovok.pchsmustang5k.com/uploads/1/3/1/3/131398560/4f955c74.pdf
    • http://files.esteemedk9.com/uploads/1/3/0/7/130775690/608392.pdf
    • http://files.curiositycabinet.org/uploads/1/3/0/8/130873810/2436995.pdf
    • https://cdn.shopify.com/s/files/1/0432/0906/4603/files/eal_sentence_building_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/9177/9999/files/7724283073.pdf
    • https://cdn.shopify.com/s/files/1/0434/7333/8533/files/tesilev.pdf
    • https://cdn.shopify.com/s/files/1/0438/3057/5266/files/maths_book_for_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0428/9642/5119/files/39801923116.pdf
    • https://cdn.shopify.com/s/files/1/0432/3485/3021/files/wiwap.pdf
    • https://cdn.shopify.com/s/files/1/0446/9476/5724/files/calculus_2nd_edition_briggs_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/povaxolotugifadaxeviv.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1906/files/all_aarti_sangrah_in_marathi_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/0718/8898/files/sivatokokodafipemotakop.pdf
    • https://cdn.shopify.com/s/files/1/0438/0504/8994/files/15541622881.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/pimenif.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_off0000623a.bin
5cff8d468949772bef7d52c2d3fbb5d50c1b4e2282babd9087ce06561417cb4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623A 5652 bytes
font_01_sfnt_off00007570.bin
a107900b5d501ac03ab09f221a3313f7a454e3e2ecf2fe386ad62265d7ab875d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7570 10264 bytes
font_02_sfnt_off00009893.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9893 4324 bytes

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