Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba2877ba85580aa…

MALICIOUS

PDF

44.7 KB Created: 2020-08-02 07:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22144a3c07fffd651d32f55223b2556c SHA-1: cff1b561de5fc5d23c1e405be34e69d8b1d76da4 SHA-256: 8ba2877ba85580aa1722d64c1defa2423d29655dc1d8e0ee1221a6955f6a547e
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 'https://ttraff.ru/pify?keyword=manual+of+structural+kinesiology+20th+edition+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains embedded URLs that are part of this redirection scheme.

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=manual+of+structural+kinesiology+20th+edition+pdf
    • http://files.2kingdoms.net/uploads/1/3/0/7/130740257/5711164.pdf
    • http://files.theskinstudioltd.com/uploads/1/3/1/4/131483279/kefimu.pdf
    • http://files.theissuenewsletter.com/uploads/1/3/1/3/131382808/vafogiragiwub.pdf
    • http://files.ianshermanlcsw.com/uploads/1/3/2/6/132695755/toliruwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6663/0050/files/neevia_merge.pdf
    • https://cdn.shopify.com/s/files/1/0434/7173/2889/files/66562824506.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mobisibat.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5813/files/nuzub.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/dowelinogifipazevugowan.pdf
    • https://cdn.shopify.com/s/files/1/0439/2851/8824/files/23543950987.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/32267377082.pdf
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/53841812953.pdf
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/7151864772.pdf
    • https://cdn.shopify.com/s/files/1/0433/8932/1366/files/jutisogosoratoluzabub.pdf
    • https://cdn.shopify.com/s/files/1/0434/6531/0373/files/55115517024.pdf
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/fozoxatezobajadowi.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_off000061d3.bin
dee47816643b9154f27c2537067cd0cbff2fe57b4852c50abb16b134624090c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D3 5744 bytes
font_01_sfnt_off00007564.bin
5abbafd985fde054e821fe56389350ba7517d7b7f6c00e55f77c2b03d8b40797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7564 9920 bytes
font_02_sfnt_off00009767.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9767 4324 bytes

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