Malicious PDF — malware analysis report

Static analysis result for SHA-256 9529a4b2f5c625e0…

MALICIOUS

PDF

41.6 KB Created: 2020-08-14 03:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08d941bafa1c45a01df5835cdfb68e12 SHA-1: 429f8203f10e7261a0350e35c022e912dbd71372 SHA-256: 9529a4b2f5c625e0ac870754b4162be647f594419e7ec5e9c870ca18fed6e8d0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=worksheet+d+taxonomic+key'. Another critical heuristic identified a large number of external PDF links, suggesting a link farm. While the document body is heavily obfuscated, the presence of these links and the ML classifier's high confidence score point towards a malicious intent, likely for phishing or malware delivery.

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=worksheet+d+taxonomic+key
    • http://dikasup.valerielecomte.com/uploads/1/3/1/3/131378776/nebopas.pdf
    • http://files.finsoc-fms.org/uploads/1/3/1/3/131378897/dinikozumawez.pdf
    • http://files.titusmountain.com/uploads/1/3/1/4/131438260/dizufesore_tedirimasatovi.pdf
    • http://files.pilatesperformancetherapy.com/uploads/1/3/1/3/131378918/vanovufazigun.pdf
    • https://cdn.shopify.com/s/files/1/0452/4598/9026/files/biodynamic_organic_and_natural_winemaking.pdf
    • https://cdn.shopify.com/s/files/1/0431/8137/5648/files/receptores_nicotinicos_de_acetilcolina.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8824/files/foliguvotobipotagovalupo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/nimodoget.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/felesozu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54101174921.pdf
    • https://cdn.shopify.com/s/files/1/0434/5187/5481/files/5833677336.pdf
    • https://cdn.shopify.com/s/files/1/0439/7491/8302/files/kuxadenaviwimad.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5018/files/33784117806.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/vizipobiguxal.pdf
    • https://cdn.shopify.com/s/files/1/0434/4869/6993/files/amiga_os_3._1.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/disadvantages_of_systematic_sampling.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005730.bin
ea2b0ef8446c2a894bde7ee68aaab3095d22e10d7ec67da6ed95454b45da9e3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5730 5184 bytes
font_01_sfnt_off000068b5.bin
6ecffde02d0cf19e0216c1dd175c1518515523d02201e5d52b72fdcf47230706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B5 10184 bytes
font_02_sfnt_off00008b74.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B74 4324 bytes

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