Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c8107d5d68d8c7…

MALICIOUS

PDF

50.1 KB Created: 2020-08-01 23:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d145dca450752a0a5fb083fda6ea5070 SHA-1: 3fd7bb08bfc471275a8dd8f6a94089104b091840 SHA-256: 78c8107d5d68d8c79725551172e55125e5fbfbefa8e5c5b54188e8195f5116b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on platforms like Shopify, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though garbled, contains the URL to this redirector and references to other PDF files, reinforcing the link farm observation.

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.com/pify?keyword=replace+multiple+characters+python
    • http://files.myrealwoman.com/uploads/1/3/2/6/132682882/vadez.pdf
    • http://files.whatsthegfc.com/uploads/1/3/0/8/130815009/porumu.pdf
    • http://files.pinevalleychurchofchrist.org/uploads/1/3/0/8/130814923/370bfe0a8d0f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6444/9437/files/jojezedidakadunosobodi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6822/files/rawulosor.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5770/files/3267685519.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/maguvisasuputupakakuvijak.pdf
    • https://cdn.shopify.com/s/files/1/0436/8017/0137/files/81509993936.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5953/files/pipabudamipinewab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0057/files/43211801812.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/roxobekogumav.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6066/files/24724013470.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/43854294630.pdf
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/rejavimabizotezorad.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063a7.bin
820ebd21b43bcdc3ccdc239505f6625ed165ae1bdbb5fcb1f30d8d551eaf5704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A7 5280 bytes
font_01_sfnt_off0000757b.bin
c8329133911a7db75c2cadadd55ea2cf59666a6836a622debf8747de7a0f21a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757B 15300 bytes
font_02_sfnt_off0000a65a.bin
e53bd0d3ed0cb588dbaece120c252382457be31a0c0f1b7ae06c11b8bf10d787		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA65A 16152 bytes

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