Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fef2715f27d4495…

MALICIOUS

PDF

43.0 KB Created: 2020-08-02 00:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7840919edaa43906eeaae38a730d32a7 SHA-1: e15fe9964e72ceddc49a7259fb8a9d7fa1e1cec9 SHA-256: 6fef2715f27d44957a339030204997b934595552d5fc063e141e4de8f7f06ca6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a deliberate attempt to direct users to potentially harmful content. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=minecraft+pe+mineplex+server
    • http://files.capronlawllc.com/uploads/1/3/1/4/131453588/75e312b6098cc.pdf
    • http://files.alljourneysfitness.com/uploads/1/3/1/3/131379594/fonabu.pdf
    • http://files.111-ed.com/uploads/1/3/0/7/130740051/mitob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/2129/2952/files/20705282048.pdf
    • https://cdn.shopify.com/s/files/1/0428/2282/8198/files/53823264699.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/22188603858.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/mexerujesekotegapujog.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0923/files/jovederefalevamufuxem.pdf
    • https://cdn.shopify.com/s/files/1/0438/0203/4336/files/setatusiwovunufesofemikol.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/lipotufubarotopuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6558/files/jupyter_run_cell_shortcut.pdf
    • https://cdn.shopify.com/s/files/1/0434/5397/2633/files/sowiduxebodixadozifosez.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2690/files/mapipinukubofu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.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_off0000682c.bin
2b69e47317f9cb87be91ce34fcb3b7510796809023ccd26dbdbd8eddad04dd04
pdf-font-stream PDF embedded font (sfnt) at offset 0x682C 5296 bytes
font_01_sfnt_off00007a30.bin
77f7d37b540777f0e54ef5db127c43a2d7587199abe90baf04eb6a56bda1e1f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A30 10748 bytes