Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1597ee1d62f6ae…

MALICIOUS

PDF

40.4 KB Created: 2020-08-18 23:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ef4f940d250089bbff5f01526617f07 SHA-1: 51119051819d4004692b78a4b9cd3f35dc89e145 SHA-256: 6a1597ee1d62f6ae4c3b0594b57ca97432dcb4a724a35907d51093047e927d9e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. This suggests the primary purpose is to direct users to malicious infrastructure, potentially for phishing or malware distribution.

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=coordinate+geometry+worksheet+class+9
    • http://towujaru.pacingpics.com/uploads/1/3/0/8/130814328/rodev-xuzaxanarawaze.pdf
    • http://files.superawesomevolleyball.com/uploads/1/3/1/4/131438604/0e522b.pdf
    • http://files.evolutionmeetings.org/uploads/1/3/0/8/130874598/mafax.pdf
    • http://defasu.loynohonors.com/uploads/1/3/2/7/132741555/nodeligofedi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/menobekazesafisubuv.pdf
    • https://cdn.shopify.com/s/files/1/0439/2812/5595/files/cambridge_checkpoint_science_3_peter_d_riley.pdf
    • https://cdn.shopify.com/s/files/1/0434/8195/6518/files/singapore_airlines_company_profile.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0357/files/lurirajaliloligegoguk.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/60603794506.pdf
    • https://cdn.shopify.com/s/files/1/0449/3488/9627/files/probability_math_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/54232343305.pdf
    • https://cdn.shopify.com/s/files/1/0435/3202/6008/files/dolasotasixozirejazop.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/wallpaper_iphone_xs_max_full_hd.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/jaxabupu.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_off00005dca.bin
3dbbcf726b1214c466f66a1e77112905cbfc545456dd2702383c53410f4246f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCA 5672 bytes
font_01_sfnt_off0000710c.bin
8a01fab0e35b7e760d4ab5d62d808ffcaf97c647703f3fac5c1556ad41031adf
pdf-font-stream PDF embedded font (sfnt) at offset 0x710C 10492 bytes