Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21c802719a350de…

MALICIOUS

PDF

39.0 KB Created: 2020-08-04 16:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39841c4319ba3d1cd011d3fd926e347c SHA-1: 6791ac75efc2435d0b96760c4b2b03068dc0b55b SHA-256: d21c802719a350de33e116307e418d1df68ee05b2ef69c56c697d176fa554b50
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though garbled, contains text related to PDF manipulation and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious content.

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=remove+blank+pages+from+pdf+acrobat
    • http://files.holytrinitybelvidere.org/uploads/1/3/0/7/130739750/2719942.pdf
    • http://fipusom.sandrabullocksmith.com/uploads/1/3/1/1/131163635/3857291.pdf
    • http://files.thegirlsgym.org/uploads/1/3/0/8/130873848/154270.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/xelojunut.pdf
    • https://cdn.shopify.com/s/files/1/0428/4012/9692/files/47845251403.pdf
    • https://cdn.shopify.com/s/files/1/0436/1093/1358/files/74359866302.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/kusuzeladijavujenobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/diralujamajawupakame.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/78152839612.pdf
    • https://cdn.shopify.com/s/files/1/0435/4686/9911/files/xabovaneludufemug.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/56133021539.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/giwewugeniwerexeguw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/kewowatavemivoguk.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/ruxafijotuteg.pdf
    • https://cdn.shopify.com/s/files/1/0431/4061/2262/files/13366162636.pdf
    • https://cdn.shopify.com/s/files/1/0439/9906/8310/files/rihanna_stay_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/6006/7480/files/4296451523.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_off000058aa.bin
8fd8d026a1bfb6d7c3a3da3eadba4ed1d1fffada6b0203e77ec8f9964e994768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58AA 5744 bytes
font_01_sfnt_off00006c2d.bin
1e910702eb050a4a6d247b2151586b2c07322719d2e67914e1b3a396ee6251e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2D 10128 bytes

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