Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b99b6fff4e9d330…

MALICIOUS

PDF

53.9 KB Created: 2020-08-19 09:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7345eda4e21895a6f9a15080d3bb9165 SHA-1: b197dfbcf6af9396567266985641c438ae6e366c SHA-256: 6b99b6fff4e9d330c5323c9d36e4de044b7dabd2497bd4dc9237d5e5097cde3a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm designed to appear as resume formats, with a primary malicious redirector URL. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to exploit vulnerabilities or redirect users to malicious sites. The embedded links likely serve to distribute the payload or lead to further stages of infection.

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=technical+architect+resume+format
    • http://files.aubreyloganterry.net/uploads/1/3/0/7/130740318/lanugalolabukike.pdf
    • http://kibifukel.henleynaturalburials.co.uk/uploads/1/3/0/9/130969904/zaxif.pdf
    • http://files.801fig.com/uploads/1/3/1/3/131398424/7030370.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/7306/0520/files/dekulajetotidafisa.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/52270321075.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/cema_belt_conveyor.pdf
    • https://cdn.shopify.com/s/files/1/0438/0390/2112/files/adverb_english_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/2129/5003/files/minecraft_mob_spawning_distance.pdf
    • https://cdn.shopify.com/s/files/1/0446/8060/9945/files/degadoronelibas.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/alcalosis_metabolica.pdf
    • https://cdn.shopify.com/s/files/1/0432/0631/2091/files/47581905991.pdf
    • https://cdn.shopify.com/s/files/1/0439/3975/8235/files/zirezawexilumero.pdf
    • https://cdn.shopify.com/s/files/1/0433/6418/8312/files/71506636957.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3485/files/dubim.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_off0000880f.bin
cbd708fb2201bfed752c401593fb2bd1b4ecc775b9c67dbda9d2928d1009b4ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x880F 4952 bytes
font_01_sfnt_off000098a7.bin
c772a90b5f2d682629200d527668ecc4337b269adbc916aa77fab765625f1664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A7 10420 bytes
font_02_sfnt_off0000bc4a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4A 4324 bytes

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