Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab186990d3604cb…

MALICIOUS

PDF

46.3 KB Created: 2020-08-11 07:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 617575ea3a8bb8957ff2bc79db438987 SHA-1: b9c01687b57cd156bbed460ab69b48505bde147f SHA-256: 0ab186990d3604cbe111bec90c3e26e45f5a6a0d474890e32d7280203a3a7f35
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 a link farm designed to manipulate search engine results. One of these links, 'https://ttraff.ru/pify?keyword=megaloblastic+anemia+in+pregnancy+pdf', is known to redirect to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document's primary function appears to be directing users to potentially harmful websites.

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=megaloblastic+anemia+in+pregnancy+pdf
    • http://bifulogux.safetywatchtraining.com/uploads/1/3/0/9/130969723/xajut-polulefivo.pdf
    • http://files.giantpawsgianthearts.com/uploads/1/3/1/4/131437123/6459514.pdf
    • http://files.lisalounsbury.com/uploads/1/3/2/8/132814286/6455994.pdf
    • http://files.shootitrawphotography.com/uploads/1/3/0/9/130969652/9035476.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/gutopenoxisominutajogal.pdf
    • https://cdn.shopify.com/s/files/1/0440/8092/2789/files/tresanti_adjustable_height_desk_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/31704993636.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bafewemuwidizisaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/36205337080.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/bobabema.pdf
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/57046121488.pdf
    • https://cdn.shopify.com/s/files/1/0430/5548/0981/files/bowapakazoxegobo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9076/files/dictionary_scavenger_hunt_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/11773588900.pdf
    • https://cdn.shopify.com/s/files/1/0437/9944/5664/files/accountable_talk_cards.pdf
    • https://cdn.shopify.com/s/files/1/0433/5114/6650/files/donawonodejamuziba.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8456/files/17249393251.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000686b.bin
a28f8b529c30879d4cddee1876a120ec0a2d6b74b40d89cb286effc173ad2ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686B 5512 bytes
font_01_sfnt_off00007b14.bin
a8d43a6b63a6655ab28bc56f4fd25426ccd769ee4ad195d9ac4fb41fb59d3a71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B14 10144 bytes
font_02_sfnt_off00009dc3.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC3 4324 bytes

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