Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffb172f796cd88e…

MALICIOUS

PDF

40.4 KB Created: 2020-08-08 06:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64adeb9e4349d62337a8c7edacc35f3a SHA-1: 1f179b9f70131136f46f4d6d01a260aa545caaf0 SHA-256: 6ffb172f796cd88e066305faa5662b264e8393cd05631f466a786e70d027ebeb
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 potentially malicious redirector infrastructure. The document body and embedded links suggest a lure to download or view content related to project management, likely as a pretext to redirect users to malicious sites. The ML classifier 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/wb?keyword=define%20project%20management%20pdf
    • http://files.creamydreamysoap.com/uploads/1/3/1/4/131455463/d2d943b91b72.pdf
    • http://files.hornywheelers.com/uploads/1/3/1/3/131381602/b301458b.pdf
    • http://files.ppmglobal.services/uploads/1/3/0/8/130873851/4444842.pdf
    • http://files.eliclothier.com/uploads/1/3/0/9/130969545/gufiniwojaxiwimod.pdf
    • http://files.dewsburymassagetherapy.com/uploads/1/3/2/6/132681772/2380285.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/gaberira.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6662/files/saxon_algebra_2_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/3476/2654/files/trello_how_to_delete_a_board.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0047/files/buzerajugaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/vector_canoe_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/6572/1503/files/retixute.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/zovimu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78214852322.pdf
    • https://cdn.shopify.com/s/files/1/0434/3323/0488/files/heaviside_function_matlab.pdf
    • https://cdn.shopify.com/s/files/1/0433/9784/1063/files/aceite_de_almendras_propiedades.pdf
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/66415272984.pdf
    • https://cdn.shopify.com/s/files/1/0437/7542/6722/files/78203510481.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/88308991355.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_off00005fcb.bin
b9b1a1e7f233fdbaed2037c8891407f92cc51b7b1d7030a9400009cc041a3997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCB 5340 bytes
font_01_sfnt_off000071ed.bin
8821051c86c719f698e0f3400e619d2515b4c4f00627f94b57868029145161a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71ED 10132 bytes

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