Malicious PDF — malware analysis report

Static analysis result for SHA-256 b456a1328f40ddc2…

MALICIOUS

PDF

46.8 KB Created: 2020-08-19 03:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b019245e9fd1f9d637156e533929d95 SHA-1: e2b148f708f4beb65b57bdd599dbda867d37962a SHA-256: b456a1328f40ddc2f78e32feecd2403a694fbe13e77fcdd73eae0c06d7ab7882
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=entrepreneurship+audio+books+free`. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with the first identified as `https://cdn.shopify.com/s/files/1/0437/2224/4246/files/authoritarian_personality.pdf`. The document body, though partially corrupted, contains the same malicious URL, reinforcing the lure of free audiobooks to redirect users to a malicious site.

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=entrepreneurship+audio+books+free
    • http://files.oklahomaliteracy.org/uploads/1/3/1/8/131871894/jinixavatavufugaw.pdf
    • http://voridet.maclucille.com/uploads/1/3/2/8/132816202/kumusaw.pdf
    • http://files.rhearuben.com/uploads/1/3/1/3/131398591/331c4198ae.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4246/files/authoritarian_personality.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/mawuginovabimitawomefo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0809/7436/files/wixupenujikomuxelid.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/16046016461.pdf
    • https://cdn.shopify.com/s/files/1/0432/8361/1801/files/31970753421.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/tabiv.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/56705162399.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/23431223125.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/24348987248.pdf
    • https://cdn.shopify.com/s/files/1/0431/5696/3479/files/mabexa.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/47455726112.pdf
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/xepujisupoxikagadawe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bb4.bin
272cf9822a905277f318ce25866bf97e6a9b5b317838a301cd2de2f5f76211aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB4 5140 bytes
font_01_sfnt_off00007d15.bin
5fa555ec76602e51e4b5d208b3bf55c541362fb3c8d6993fc952f91de6dbc773		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D15 10292 bytes
font_02_sfnt_off0000a059.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA059 4324 bytes

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