Malicious PDF — malware analysis report

Static analysis result for SHA-256 6842b01bb1b5a991…

MALICIOUS

PDF

41.4 KB Created: 2020-07-29 08:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7572319c1d24b10c3f17955ff1ca68b8 SHA-1: 4fa0610328474a5d0cce02313004c9bfb15420ad SHA-256: 6842b01bb1b5a991179a3acf928f207b3b6501cbba127280678997fdd89c818c
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. This, combined with the 'SE_DOWNLOAD_BUTTON' heuristic, suggests a phishing or scam attempt where the user is tricked into clicking a link that redirects to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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=halloween+background+templates
    • http://files.mmedejong.com/uploads/1/3/2/7/132710756/ad16b7d.pdf
    • http://files.westsoundgreenstem.net/uploads/1/3/1/4/131452982/0bc68b3cd5ed5cb.pdf
    • http://files.laurawardauthor.com/uploads/1/3/1/6/131636792/vuseregose.pdf
    • http://files.joshsaleh.com/uploads/1/3/1/4/131408056/lumakutunojezuda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/95509007145.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/xitujunenidi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8339/9329/files/rosudatadazukorupudowug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/69568017853.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/zogokisubopakepafojaxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/28564472799.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/26866725574.pdf
    • https://cdn.shopify.com/s/files/1/0437/3184/5271/files/57510602946.pdf
    • https://cdn.shopify.com/s/files/1/0429/7247/9647/files/tukemedudew.pdf
    • https://cdn.shopify.com/s/files/1/0434/3290/2806/files/17986402521.pdf
    • https://cdn.shopify.com/s/files/1/0432/4088/2340/files/32731304805.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_off000063a6.bin
ac0665239af375cbb242a39bdc0c05db4b57e147e252ed44e22e6126e3727417		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A6 5484 bytes
font_01_sfnt_off00007640.bin
f79c2aca02d49d5e236dbe1cd0a21b14c2a1cbf4a0395515bc5a8131b0e2863d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7640 10100 bytes

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