Malicious PDF — malware analysis report

Static analysis result for SHA-256 372b3d3303fd2aca…

MALICIOUS

PDF

51.6 KB Created: 2020-08-09 23:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f75e726bcfde2f098ba12bdf85e64faa SHA-1: 89cf054ef5ac65e5dc2c261883e536f5081a10a2 SHA-256: 372b3d3303fd2aca0ac1a214c20e37477c52a4c5ff146f35c1f8aa1f376c30db
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, with the primary redirector URL identified as malicious. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=world+all+important+days+pdf', suggesting a lure related to 'important days'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the redirector. The ML classifier also strongly indicated maliciousness.

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=world+all+important+days+pdf
    • http://rozofu.katekinsey.com/uploads/1/3/1/6/131606289/1cc7c9daa0.pdf
    • http://jomojig.thebridgebetween.co.uk/uploads/1/3/0/7/130775257/8696050.pdf
    • http://files.karlkueffel.de/uploads/1/3/2/6/132682623/miwegezif_sutebukulizuvu_sukav_xivavamazojo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0450/9853/files/69967220662.pdf
    • https://cdn.shopify.com/s/files/1/0433/8787/9587/files/tanafowazadesiran.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/65162904584.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6502/files/5479373107.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0135/files/failed_to_login_invalid_session.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7430/files/tewelakeje.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/zuwevibavevone.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/8658731206.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/clinical_pharmacy_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/52193925706.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/nedorajopujib.pdf
    • https://cdn.shopify.com/s/files/1/0431/0794/2549/files/jokositadakiruroj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9768/files/law_of_diminishing_marginal_utility_in_economics.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/
    • https://cdn.shopify.com/s/files/1/0433/3892/4

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008aba.bin
396da50edd895bc5fe9417ba534bdd12d5130d79c78e8b85436387c5941426c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABA 5300 bytes
font_01_sfnt_off00009cbb.bin
48dca505bb56e7cd4c48abafb8b72312bfbf9d5cdf3dc2bb4f2a197792a0f33c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CBB 10544 bytes

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