Malicious PDF — malware analysis report

Static analysis result for SHA-256 084654beb6537bd6…

MALICIOUS

PDF

44.5 KB Created: 2020-08-28 03:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99e0c70fc17a25305ad0e7c959463c3d SHA-1: d083aa6b61c3adf80d753d936bd525097aafa9f0 SHA-256: 084654beb6537bd640624029029d2cbde8058bee97e93691a0f4e3f2e9b9c8cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure. 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=native+american+symbols+and+meanings
    • http://files.timepilgrims.com/uploads/1/3/1/4/131452840/590229.pdf
    • http://rasagud.bsakoaks.com/uploads/1/3/1/8/131871505/2493412.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/0692/5720/files/smallville_season_7.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/75956668890.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/82867127202.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/76940320216.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/ssp_self_certification.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/summoning_calculator_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2589/files/fasavuwuxejelop.pdf
    • https://cdn.shopify.com/s/files/1/0434/5813/4168/files/gozefisomej.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1781/files/sewulajusa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1391/5303/files/gifozofe.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/html_to_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8354/files/current_affairs_april_2019_adda247.pdf
    • https://cdn.shopify.com/s/files/1/0428/1060/5735/files/jafapamujutu.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_off00006365.bin
128520553b89a1be5c9ce0085cf917f544ee94fd30b172c7d8d65efd1838fb77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6365 5316 bytes
font_01_sfnt_off00007561.bin
1b1c68715149494298856b6440a9ce794689b0b23a55319e296791fdd0e5b31e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7561 9888 bytes
font_02_sfnt_off00009725.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9725 4324 bytes

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