Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a839bc9a2edf0a…

MALICIOUS

PDF

44.7 KB Created: 2020-08-03 16:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5f2c4a3d79b985b86988d75ca24ccd3 SHA-1: 7b26c7e8d2bbca4549f398baae7ef8cb17c6259c SHA-256: 20a839bc9a2edf0ad7271b8cdef46fc419ec7385c31df9353f95f272cc73f117
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click the malicious redirector URL, likely leading to further malicious content or downloads.

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.com/pify?keyword=turn+of+the+screw+book+pdf
    • http://files.davenhamparish.net/uploads/1/3/1/0/131070469/bofejowev.pdf
    • http://files.blueridgebaptistchurch.org/uploads/1/3/0/8/130874265/2317157.pdf
    • http://files.learningdifferencesresourcegroup.com/uploads/1/3/1/3/131381799/sanejozejidodam_wilekejet_setapivi_nepijebona.pdf
    • http://files.christinariviere.com/uploads/1/3/1/0/131070450/4850445.pdf
    • http://files.questioningdevelopment2016.com/uploads/1/3/1/3/131384070/jiwunukovisenaru.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/81780437688.pdf
    • https://cdn.shopify.com/s/files/1/0438/4666/4349/files/497788030.pdf
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/pipefitter_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/datofugilasififuko.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/mori_seiki_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/42131053462.pdf
    • https://cdn.shopify.com/s/files/1/0434/4227/4454/files/rheem_criterion_ii_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0447/9628/0993/files/1986_honda_shadow_1100.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5878/files/8159272564.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9217/files/zavedixawiludawuxofi.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_off000070aa.bin
e833312b4c708c4ba79eaccb86f0313075df0d2878f9e6b70c6af5b39563359a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AA 5248 bytes
font_01_sfnt_off00008291.bin
3dfbc0e4b97355bd5c228f6765f6e75dedf53dfed1976234b1a8a2d07f868acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8291 10200 bytes

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