Malicious PDF — malware analysis report

Static analysis result for SHA-256 1609043a2e9b714e…

MALICIOUS

PDF

41.3 KB Created: 2020-08-13 22:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9425d9855a18e0e943465df3545941db SHA-1: 74e1bb39376f4da2855290727c08b7fc508e6235 SHA-256: 1609043a2e9b714e3a62b6cd6cb8076f3894f0e898aad5192d518d485a93aed8
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body also includes a call-to-action phrase, suggesting a lure to click the malicious link. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=pata+chalgea+song++pagalworld
    • http://files.en.icm-basel.ch/uploads/1/3/1/4/131437775/f1bd51.pdf
    • http://rosidak.escher2hands.com/uploads/1/3/1/8/131871921/veganixexela-vejokanafim.pdf
    • http://toxod.newriverknockouts.org/uploads/1/3/0/8/130814328/229980.pdf
    • http://fusaguzo.bespokecabinetworks.co.uk/uploads/1/3/1/4/131482975/fidat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/4711149724.pdf
    • https://cdn.shopify.com/s/files/1/0429/2683/3823/files/30423780886.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3132/files/xiwavikilosuxugami.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/735009183.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/56078697521.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/94726751918.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/invitation_to_computer_science_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/berichtsheft_ihk_vorlage.pdf
    • https://cdn.shopify.com/s/files/1/0435/5473/4241/files/melogipifelupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3934/2248/files/divenudumibiju.pdf
    • https://cdn.shopify.com/s/files/1/0429/0969/6156/files/52588679826.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/71385396829.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f2f.bin
ce643edb1d5691f54ae856a7df11e1312d428cf14c6ac364e053dc33087d7b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2F 5428 bytes
font_01_sfnt_off000071a6.bin
1b5b3ce6da250065f859e04a8112f27956d11bae6c70b5d35a59f6d4b84dfe6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A6 11412 bytes

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