Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0100d0669aa63f…

MALICIOUS

PDF

50.9 KB Created: 2020-08-18 19:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7236772535b703f492989fe2836e1746 SHA-1: 7c8e9c407ffd7116b22a499f6ab054d9a995d4e7 SHA-256: 4d0100d0669aa63fbb18f7f14f770072b923e5a80473de9e493e47040347599d
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with the primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Boater exam chapter 5 quiz answers' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The heuristic firings confirm the presence of a malicious redirector link and a link farm, indicating a probable attempt to distribute malicious content or phish users.

Heuristics 3

  • 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.
  • 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=boater+exam+chapter+5+quiz+answers
    • http://files.wsrpc.com/uploads/1/3/0/7/130776111/01f53dd2.pdf
    • http://tokit.shalomtuscaloosa.org/uploads/1/3/1/1/131164199/pabevalakiwuz_lebomif_nuzeputomirigem.pdf
    • http://files.brewsterbainbridge.com/uploads/1/3/2/6/132695629/fomiguwezog.pdf
    • http://wagalek.improvplayground.com/uploads/1/3/2/7/132740900/vofonedamal.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/60607968884.pdf
    • https://cdn.shopify.com/s/files/1/0433/3430/3912/files/tipamitixapomofibuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/4095/5803/files/bundled_tube_structure.pdf
    • https://cdn.shopify.com/s/files/1/0435/8668/3037/files/85949767858.pdf
    • https://cdn.shopify.com/s/files/1/0434/6924/2534/files/pikisizoferijaroro.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/zaxugipokipiban.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8498/files/13924707932.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/gapufezujakuvolegekira.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/61959184624.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/spanning_tree_algorithm.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_off00008593.bin
490ed6ab8deceb529369267950554e34f8ea15e031199aba74ee47abf2674434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8593 5652 bytes
font_01_sfnt_off000098cd.bin
1f214327e4987f974d70ec390d46154bc55fb54f8dc61a45ec591f5332162468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98CD 11288 bytes

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