Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc50a11de49bcae…

MALICIOUS

PDF

40.9 KB Created: 2020-08-01 19:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a31f149d6c01f9b61e9034254858a9e0 SHA-1: fbd99906c8b5212477879a8acaf685987019bfa0 SHA-256: 0bc50a11de49bcaebebe560fa14d63402536f91eb947638d59e18b0adab17377
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, a technique often used for SEO poisoning or to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The ML classifier strongly supports the malicious nature of this PDF.

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=scoreboard+command+minecraft
    • http://files.chroniclesofanoverthinker.com/uploads/1/3/0/8/130874097/ropatanikuge.pdf
    • http://files.marketstreetartspot.com/uploads/1/3/0/7/130739719/8107619.pdf
    • http://files.theworldofmcewan.com/uploads/1/3/0/7/130738814/gibaja_tawix_wododibura_musimetal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/xosar.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/47330747635.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/wawixadikivuwewobiwuji.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1702/files/xatigolasexopeji.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/6785985580.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3964/files/redusuvalibilal.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/76894219625.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7911/files/96422839421.pdf
    • https://cdn.shopify.com/s/files/1/0434/4109/4812/files/67011147760.pdf
    • https://cdn.shopify.com/s/files/1/0431/6554/8708/files/fegavekupev.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/53462184297.pdf
    • https://cdn.shopify.com/s/files/1/0428/9101/8396/files/47433728441.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/mozafesikeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/4460/9943/files/jimujuwarozegu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006367.bin
3cedf88357d916b6bb4e9b7659d2f8a7d7cc74a7ef650759913cec18bacc8047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6367 5200 bytes
font_01_sfnt_off00007500.bin
84e15dd415e43f6b8cb69e0a8e513b25ef692206c37c709f6ba736453bd28603		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7500 9988 bytes

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