Malicious PDF — malware analysis report

Static analysis result for SHA-256 4045d13b0c6fe262…

MALICIOUS

PDF

47.3 KB Created: 2020-08-02 18:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 338e746c8ddeb7aee5c470200e467314 SHA-1: 2dad4b4366c3043f446ad423a190ff030a203fc5 SHA-256: 4045d13b0c6fe262cec1a44108977a8f2ff973028d249fe70b1f8768ffaf17ef
152 Risk Score

Malware Insights

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

The PDF was flagged for containing a large number of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=stardew+valley+crop+spreadsheet', which is also listed as a malicious redirector. This suggests the primary goal is to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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=stardew+valley+crop+spreadsheet
    • http://files.foxfarmapiary.com/uploads/1/3/0/9/130969761/3657681.pdf
    • http://files.thebetterbrasspipe.com/uploads/1/3/2/7/132740218/daf3e1d8396c143.pdf
    • http://files.kristindonerstudios.com/uploads/1/3/0/7/130776069/virigokunew.pdf
    • http://files.opulenceboutiquewollongong.com/uploads/1/3/0/8/130813546/bajijuwuvirewoj.pdf
    • http://files.aevamagazine.co.uk/uploads/1/3/0/7/130740018/dupabon.pdf
    • http://files.foxfarmapiary.com/uploads/1/3/0/9/130969761/
    • https://cdn.shopify.com/s/files/1/0430/7851/6885/files/fomadonibulazozegetibe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/fobowuvinedaxebozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4514/3207/files/12189036711.pdf
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/35041184757.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/karazawakuwujolowofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/54860192758.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/jenudirerawilusudunufuxof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zutowujovepenatugipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2334/files/roserava.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/relajujilirapem.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/barusorugavadef.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/kedegukevomotolala.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9663/files/transparent_hex_color.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78992801071.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_off000076d0.bin
1f61f83dc59e239d9c245c743d56b3f9dd3e683f2e0a60fe0dcd3373a87d3841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D0 5516 bytes
font_01_sfnt_off000089a4.bin
63951b87485cc230483fe431bafd65ad4c5b33ffc6b871eb89bb316d5f6aecfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A4 11684 bytes

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