Malicious PDF — malware analysis report

Static analysis result for SHA-256 996dd422e94acd60…

MALICIOUS

PDF

53.5 KB Created: 2020-08-10 11:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f97c9e951eae1b1b303be609cd53049 SHA-1: 7504ca712e384463d8e4cfa70c50778195cd5cb3 SHA-256: 996dd422e94acd602ffb65985c915cf3b54939b6ec271f3d75187081864b0d92
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that triggers this redirection. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user through a deceptive document title to a malicious redirector.

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.cc/pify?keyword=to+detect+the+presence+of+adulterants+in+sugar+pdf
    • http://files.springdalecustomcabinets.com/uploads/1/3/1/6/131606065/f2f0adad0.pdf
    • http://files.naturecoastorchidsociety.com/uploads/1/3/1/3/131379846/5439444.pdf
    • http://files.patriciawilkins-vacca.com/uploads/1/3/1/3/131384401/vabumudorako.pdf
    • https://cdn.shopify.com/s/files/1/0432/6791/5936/files/piselijirifobugajuvirira.pdf
    • https://cdn.shopify.com/s/files/1/0431/1040/0153/files/44143464064.pdf
    • https://cdn.shopify.com/s/files/1/0437/8250/4600/files/21141849626.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0741/files/makufaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/animation_mixin_using_parametric_mixins.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/activity_books_for_4_5_year_olds.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/rexofo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zamujogeve.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/xijiniwedagevu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/jetowamojatiwizili.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0728/files/tivakijifezajixitumedep.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6965/files/50594485462.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/tedox.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_off00008b6f.bin
0727529401fe802ed9d02ac4b3bed84f53da9d0a5838f1dab7fe2f7579417e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6F 1696 bytes
font_01_sfnt_off00009399.bin
9a812789aab5ec154c8a2a04b1d40bf355da04e0024e90ce522aa08ddd0a3ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9399 5368 bytes
font_02_sfnt_off0000a5d2.bin
74fddbe30935a41bd88153b4989d88eb431264466f07be114e64ba2548a14201		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D2 10144 bytes

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