Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a16eaa59be72060…

MALICIOUS

PDF

42.2 KB Created: 2020-08-12 22:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25e790e7b1aa0242ffe48c43fb15e362 SHA-1: cc133e4f5bf5b9d4f30fae9d7600691eb8462b01 SHA-256: 3a16eaa59be7206047aa14836c1e65862bfaf7bb74d436cb3860811f2547dd4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to Shopify domains, likely for SEO manipulation. One critical link directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the text 'Types of blindness pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and embedded links indicate a malicious redirection attempt.

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=types+of+blindness+pdf
    • http://rulamip.indianlandsocceracademy.com/uploads/1/3/2/8/132814930/rigusifagomo.pdf
    • http://files.torbaycleaningco.com/uploads/1/3/0/7/130776255/8339749.pdf
    • http://files.crimsonacresfarm.com/uploads/1/3/0/7/130738614/4754492.pdf
    • http://files.electronicrepairegypt.com/uploads/1/3/1/4/131413362/jerovimadim.pdf
    • https://cdn.shopify.com/s/files/1/0435/9654/6216/files/69307805350.pdf
    • https://cdn.shopify.com/s/files/1/0435/3907/1144/files/linksys_extender_setup_re3000w.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/zebusukasujuvugefapepo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/79391435388.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9574/files/lugudamule.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/47258511823.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/nusegokosexoboleluwibej.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/43868426119.pdf
    • https://cdn.shopify.com/s/files/1/0434/5790/4792/files/nyc_subway_map_manhattan.pdf
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/49794679142.pdf
    • https://cdn.shopify.com/s/files/1/0432/4543/7083/files/regivoronov.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/begezuwuwoduvewufilaxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1513/3605/files/feladoliwedu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4052/8792/files/mapreduce_in_python.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_off00006803.bin
476c52db6a96a681a83b9655fe0840271d880cf773278865ca9192b843164044		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6803 4920 bytes
font_01_sfnt_off000078db.bin
f9cbfd717965fe1617d9eda0b26ed51d1ce7ee1060c3a8325d20cbba00d9ec12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DB 10312 bytes

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