Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d88e3d6ff0eb5cc…

MALICIOUS

PDF

42.5 KB Created: 2020-08-26 08:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 231019bdca75cf7000f17aa8432d82b8 SHA-1: e8e4c24d94e530f06d3240102f4b31dd09ec70a3 SHA-256: 2d88e3d6ff0eb5ccc75f5426c48571856468821d24be903f5bf2d0cc3fdb30f3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are part of a link farm hosted on Shopify, designed to obscure the ultimate destination. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and appears to contain the malicious URLs within its structure.

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=every+living+thing+by+cynthia+rylant
    • http://files.togetheractnow.org/uploads/1/3/0/7/130740264/xidin.pdf
    • http://files.educationfoundationoflm.org/uploads/1/3/2/7/132710779/gefiladotila-faturibilud-fufutelebo-xarumumovimomol.pdf
    • http://rudol.thechocolatetour.com/uploads/1/3/1/8/131856703/d2810d00ea2b.pdf
    • http://files.philadelphiapediatrics.org/uploads/1/3/0/9/130969079/0e8edac97f.pdf
    • https://cdn.shopify.com/s/files/1/0428/6418/1404/files/sifakizid.pdf
    • https://cdn.shopify.com/s/files/1/0437/2843/7409/files/biochemistry_book_by_u_satyanarayana.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/44718478395.pdf
    • https://cdn.shopify.com/s/files/1/0431/6538/4866/files/4484103805.pdf
    • https://cdn.shopify.com/s/files/1/0437/1100/4821/files/number_formatter_java.pdf
    • https://cdn.shopify.com/s/files/1/0438/7520/5288/files/57790375725.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/technical_analysis_drive.pdf
    • https://cdn.shopify.com/s/files/1/0457/6487/0300/files/official_guide_wales_coastal_path_llyn_peninsula.pdf
    • https://cdn.shopify.com/s/files/1/0448/0276/9053/files/weedeater_riding_mower.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/82971954621.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/elements_of_information_theory_solution_manual.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_off000067c4.bin
5a8ad24a64117108bbe1f53128322f210db423cd68e73b726ff6bf93fa3dd45a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C4 5140 bytes
font_01_sfnt_off0000794b.bin
f970cf8f65b5dbcf7a82555211afbb491d319af6c133a7daae28781c79bb9f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794B 10308 bytes

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