Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a57342dccee1a2…

MALICIOUS

PDF

52.6 KB Created: 2020-08-06 10:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23b10fbe9cbfcf9a3dae8317d465c35c SHA-1: c7af13cc32a80937236ae539d6eb5729e740e096 SHA-256: 36a57342dccee1a2199fe678078f9bbd06a91b97fc4c6628cdb5af1ae83988d6
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, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to redirect users to potentially harmful content.

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.ru/pify?keyword=integral+of+inverse+trig+functions+pdf
    • http://files.secretseeker.com/uploads/1/3/0/8/130874544/7348951.pdf
    • http://files.lesiasochor.com/uploads/1/3/1/0/131069869/d0c0999.pdf
    • http://files.masterthompson.us/uploads/1/3/1/8/131857758/d0175694.pdf
    • http://files.apragp.org/uploads/1/3/0/8/130814200/miruxiwezobig-mufigor.pdf
    • http://files.leadaltitude.com/uploads/1/3/1/3/131380745/3893243.pdf
    • https://cdn.shopify.com/s/files/1/0440/5490/4997/files/bet_equation.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/20450691193.pdf
    • https://cdn.shopify.com/s/files/1/0430/9614/6073/files/gutimon.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/jizitigefamamerokav.pdf
    • https://cdn.shopify.com/s/files/1/0439/3022/2747/files/bebobaferisofawokozinikat.pdf
    • https://cdn.shopify.com/s/files/1/0434/4266/7676/files/22041388444.pdf
    • https://cdn.shopify.com/s/files/1/0440/2990/2998/files/famozut.pdf
    • https://cdn.shopify.com/s/files/1/0439/0086/2619/files/77391859420.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/11338176379.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/48589746208.pdf
    • https://cdn.shopify.com/s/files/1/0436/8538/0246/files/wotin.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4355/files/jefov.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/50117177543.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6558/files/animal_farm_full_text.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_off00006eca.bin
8f4a353d5bdd6536504655efc606e08b06183ffc1e7b9cbe317b768b8526dae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECA 5320 bytes
font_01_sfnt_off000080ff.bin
1652042732320b19386aa7f8f44d3668e071a9a4b5567293df37f0bf844c21da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FF 14668 bytes
font_02_sfnt_off0000b038.bin
149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB038 16036 bytes

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