Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6a413874b6b991…

MALICIOUS

PDF

45.9 KB Created: 2020-08-04 03:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c64e366f0d0d7eae7cf0249404b32dec SHA-1: 061b62eb1f5a873069aa5e0529209e77cd2e8f65 SHA-256: bf6a413874b6b991e72e2da84e4c16a4e3acd2c524a3093e85f662eee241f520
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 pointing to Shopify domains hosting other PDFs, which is indicative of a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=psychological+disorders+pdf'. The ML classifier strongly supports the malicious verdict. The document body contains garbled text and metadata, but the presence of the malicious redirector URL and the link farm structure strongly suggest a malicious intent to redirect users to harmful 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=psychological+disorders+pdf
    • http://files.domaci-inc.org/uploads/1/3/1/3/131380279/1c21a.pdf
    • http://files.studioschmidtdesigns.com/uploads/1/3/0/8/130814868/devazofupopokako.pdf
    • http://files.zambezigametrails.com/uploads/1/3/1/6/131607075/tulupubufojixip-rizibavemaxu-kadikimun.pdf
    • http://files.annaadam.net/uploads/1/3/2/3/132302802/1849f.pdf
    • https://cdn.shopify.com/s/files/1/0431/8819/1394/files/xenefuxebugikov.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/30253004574.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89120683065.pdf
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/tetopasazeget.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/kukapememuzeriba.pdf
    • https://cdn.shopify.com/s/files/1/0428/5431/8239/files/sozowiwixiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/36382392644.pdf
    • https://cdn.shopify.com/s/files/1/0434/4938/5126/files/josogudadobadepupaxat.pdf
    • https://cdn.shopify.com/s/files/1/0429/5557/1353/files/76053292950.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulexukiwogefera.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/27545427288.pdf
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/67617203116.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/9235687922.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_off00007512.bin
d5fa8b2f2ea6f47bb8ef876eb8a0cb10273b61613887f0a2d1eed4e576317e8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7512 5520 bytes
font_01_sfnt_off000087db.bin
8f3adf82fc086dd1bbed75b8b167c5417bab3f2ec646eef258fc46942a97fef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87DB 10224 bytes

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