Malicious PDF — malware analysis report

Static analysis result for SHA-256 083621ac41a72c81…

MALICIOUS

PDF

51.8 KB Created: 2020-08-18 21:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1616820e157e159ee546944fdf93554a SHA-1: db91a8b0a4a93ddce48661d349a66007960200ce SHA-256: 083621ac41a72c81c20bdce4fd86f46453dc0413ced590d016dfaf309454f3a9
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with one prominent URL pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary purpose is to lure users to malicious sites, likely for phishing or to download further malware.

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=comprehension+passage+worksheet+for+grade+3
    • http://zegaveb.hearthandcaravan.com/uploads/1/3/0/9/130969060/fd4e5019c8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8339/9329/files/kolidimelubesupefod.pdf
    • https://cdn.shopify.com/s/files/1/0432/6290/2438/files/41558093442.pdf
    • https://cdn.shopify.com/s/files/1/0432/7922/0891/files/68010702919.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6201/files/pembentukan_batuan_sedimen.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/98770964422.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6362/files/sapozepatidamumuwar.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/87832184992.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/49782607555.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/76352460809.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6055/files/avatar_the_last_airbender_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/10927728479.pdf
    • https://cdn.shopify.com/s/files/1/0431/8363/6644/files/army_technical_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3367/files/5866993478.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e80.bin
e38b82d9f659cf0ed8c44018441d1c89fddc7b8bce81d6a4a0755917e4cd5f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E80 5556 bytes
font_01_sfnt_off00009151.bin
6394d017421599ec4f5766513005a98ec9ba0cd55f992a43848de9f7dfca32d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9151 10044 bytes
font_02_sfnt_off0000b3b0.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B0 4324 bytes

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