Malicious PDF — malware analysis report

Static analysis result for SHA-256 c498ce8344180a33…

MALICIOUS

PDF

45.1 KB Created: 2020-08-26 01:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09dec53317504f5104ae5623dd7ccdd1 SHA-1: af148fcd56f5b6f054cdad43584a65bedd014058 SHA-256: c498ce8344180a33d58520ad6a11faf2b8132a0b3a0a47cbfb7b841cb546a1a7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text suggesting a lure related to 'mastering public speaking pdf'. The primary malicious IOC is the redirector URL, which is likely used to serve further malicious content or phishing pages. The PDF also hosts a large number of links to other PDFs, potentially for SEO manipulation or to spread malicious content across multiple domains.

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=mastering+public+speaking+pdf
    • http://files.kennylakehawks.com/uploads/1/3/1/4/131406086/bd2ff53.pdf
    • http://files.13dfiling.com/uploads/1/3/0/7/130739891/lutoma.pdf
    • http://tekeru.westmichiganwinejazz.com/uploads/1/3/1/3/131380284/zenebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/nigexakofidijukinekesaki.pdf
    • https://cdn.shopify.com/s/files/1/0438/5721/5648/files/nopemibewodaza.pdf
    • https://cdn.shopify.com/s/files/1/0435/5915/7921/files/as_she_fades_abbi_glines_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/examples_of_action_research_projects_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/rational_functions_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0459/6999/7984/files/66787257502.pdf
    • https://cdn.shopify.com/s/files/1/0459/8648/0285/files/cambridge_checkpoint_science_coursebook_9_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/fizugowogefikedotanej.pdf
    • https://cdn.shopify.com/s/files/1/0428/1260/4582/files/likanekegaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/30660729497.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/50541492455.pdf
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/19254938062.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/98065534467.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/funif.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070ea.bin
31fdc5469a56c2bf4385515dadcf5a378e28a7e9d0357be4bdfd18724aebad77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EA 5532 bytes
font_01_sfnt_off000083c1.bin
0d1bf925d2846efb5e47661c8d34a1672c104b1d2615878a7054b8c2a0445e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C1 10300 bytes

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