Malicious PDF — malware analysis report

Static analysis result for SHA-256 739ce840fbda76d9…

MALICIOUS

PDF

52.6 KB Created: 2020-08-04 22:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89ac2a8dc420d4de42946f5e0d3eda14 SHA-1: c3547e0e4fa3ce9529216f5be9d57e38e412194b SHA-256: 739ce840fbda76d9d0cd6b8b1de09c5dd7e42dbb762de7823f672ffe55773a23
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and keywords related to 'optimal binary search tree algorithm pdf', suggesting a lure. The presence of a large number of external PDF links also indicates a potential SEO link farm, often used to mask malicious activity or drive traffic to malicious sites.

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=optimal+binary+search+tree+algorithm+pdf
    • http://files.executiveinformationsystems.net/uploads/1/3/1/3/131380687/kurutaravoze_pusowuwefi_luwenim_gibefoweju.pdf
    • http://files.dhketterling.com/uploads/1/3/2/7/132740804/baruzilugira.pdf
    • http://files.gloverparkcommunitygarden.org/uploads/1/3/1/0/131070911/timasunazenofe.pdf
    • http://files.knowlton.ca/uploads/1/3/1/3/131383247/fd195dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0243/6512/files/88376058468.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9032/files/vugolaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2019/7789/files/51997502067.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/40520074602.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/19179287838.pdf
    • https://cdn.shopify.com/s/files/1/0435/5375/1189/files/97684604952.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/83010700987.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/fevefadixatinupekiruk.pdf
    • https://cdn.shopify.com/s/files/1/0438/3126/3394/files/juxoxujinalogudi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4179/1895/files/93903507823.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/rupofavutudojisuvoretadu.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_off00007463.bin
bdc6a35ab3f13b53d6af670159638b70979a44cadafd38e6f1305b7e701166d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7463 5836 bytes
font_01_sfnt_off00008810.bin
d7602aed205bf95b602e280e3ec53f0fe6d07b783be699c0b475f5ee1304edd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8810 11920 bytes
font_02_sfnt_off0000b0d4.bin
9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D4 16036 bytes

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