Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bca6db6d9c5b20…

MALICIOUS

PDF

87.4 KB Created: 2020-08-06 03:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83653c38d87e0ccaefbe3b1ebe8fe27a SHA-1: d69d21a2e3a85bdd762c460aac177b630ca02b13 SHA-256: 11bca6db6d9c5b208cfe156c1bc30483c4e4cf66b49312aa05bf4a5348867935
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is part of a larger scheme to generate traffic or distribute malicious links, with many embedded URLs pointing to PDF files. The ML classifier strongly supports the malicious nature of this PDF.

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=wavelet+transform+theory+pdf
    • http://lamamupev.joanbennettcelebrant.com/uploads/1/3/1/6/131607163/4964463.pdf
    • http://files.cmtwaterhousings.com/uploads/1/3/1/3/131380456/zojed.pdf
    • http://sutiwazi.ucsdnsysusymposium.org/uploads/1/3/1/3/131381428/5533802.pdf
    • http://files.deafcan.org/uploads/1/3/1/3/131397946/dojarakuter.pdf
    • http://files.cashfromtreasures.net/uploads/1/3/1/8/131871816/059d4402.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/remobim.pdf
    • https://cdn.shopify.com/s/files/1/0428/7637/1110/files/although_vs_despite.pdf
    • https://cdn.shopify.com/s/files/1/0447/8740/0864/files/new_antidiabetic_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0450/4974/1464/files/6_functions_of_nouns.pdf
    • https://cdn.shopify.com/s/files/1/0429/1854/3523/files/51770497792.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/convert_multiple_ppt_to.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/77012919945.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/pazedamuzovivatasafoku.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/21273734898.pdf
    • https://cdn.shopify.com/s/files/1/0430/3480/4375/files/43007610782.pdf
    • https://cdn.shopify.com/s/files/1/0437/7313/2957/files/bodybuilding_muscles_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67331216746.pdf
    • https://cdn.shopify.com/s/files/1/0435/7403/4600/files/18779583041.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d7.bin
b7588e8238b06168134288ce5aef55eb2bf9be507f78fd613c16dc5d4bbe37f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 5196 bytes
font_01_sfnt_off0000f668.bin
424e01d9fe7d6017f98e7a4d0f1681d532bcb494eca1cee0db25f22402a0801f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 16676 bytes
font_02_sfnt_off00012a36.bin
ed0304b13310518b1365a505073a62d1b78b5f5b4f56be4c4d8623d0775ddf8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A36 16764 bytes
font_03_sfnt_off000141b6.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141B6 4324 bytes

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