Malicious PDF — malware analysis report

Static analysis result for SHA-256 43af31891c1adf37…

MALICIOUS

PDF

41.9 KB Created: 2020-08-05 01:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb32d37c60da357de5ef19fe3213958d SHA-1: a048b9ef104c7024eaa7815b1faaeba620f704cd SHA-256: 43af31891c1adf373e1206f7b11891156506c29c956bc686067005ebfc786643
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm or SEO manipulation scheme, embedding a large number of external links. One prominent URL, https://ttraff.ru/pify?keyword=libro+administracion+de+la+cadena+de+suministro+ballou+pdf, is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=libro+administracion+de+la+cadena+de+suministro+ballou+pdf
    • http://files.illustrationpad.com/uploads/1/3/2/3/132303010/kexulule_kubepawikupisex_rifurezez.pdf
    • http://files.jessethomascomics.com/uploads/1/3/2/7/132740249/aab553d175f943.pdf
    • http://files.ansomproductions.com/uploads/1/3/1/4/131454850/7100536.pdf
    • http://files.monval.org/uploads/1/3/1/4/131437567/xebosedupadetot-segizusaxo-gawinimumixon-vuwoxij.pdf
    • http://files.brewingtonpreciousdanes.com/uploads/1/3/2/7/132740362/ronarevutarid.pdf
    • https://cdn.shopify.com/s/files/1/0429/6412/3814/files/99825105139.pdf
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/36374757387.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0117/files/zasivewamopop.pdf
    • https://cdn.shopify.com/s/files/1/0429/2752/1948/files/83366699103.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/java_file_transfer.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/29056410771.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/54837917505.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9064/files/19608890427.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0997/files/zuwebigatuwiwumiminejiv.pdf
    • https://cdn.shopify.com/s/files/1/0450/5174/0310/files/diablo_3_xbox_360_modded_saves.pdf
    • https://cdn.shopify.com/s/files/1/0431/5922/4480/files/kaplan_step_2_ck_videos_2016.pdf
    • https://cdn.shopify.com/s/files/1/0431/5319/5157/files/sawaradafufopos.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5144/files/21735115385.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_off00005ebb.bin
c0eed9951821de2b335dec1d1fdb45b57945f642d20dc88b5a4094f1dac9d5b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBB 5384 bytes
font_01_sfnt_off000070ef.bin
b54a69ccb03bf58c3f2506ec65dd1c6aeea38e9f1a43465cb4f7dc7d8258bdda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EF 12068 bytes

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