Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e3ae734a38cb00…

MALICIOUS

PDF

64.3 KB Created: 2020-10-11 13:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d5bfb3a79cbbbbb4235cbac59aeac915 SHA-1: 7ae841383e824b6561d283d2b97eae4b1d9200ee SHA-256: 52e3ae734a38cb00585ba43025ea80bf08502a3d8f744e5c31ac399c01faccab
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains multiple embedded links. One of these links, 'https://gettraff.ru/strik?keyword=mhgu+silver+rathalos', is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous links to disposable hosting further supports a link farm or phishing scheme.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=mhgu+silver+rathalos In PDF document text
    • https://site-1043165.mozfiles.com/files/1043165/luxusini.pdfIn PDF document text
    • https://site-1038416.mozfiles.com/files/1038416/danejibep.pdfIn PDF document text
    • https://site-1039837.mozfiles.com/files/1039837/55637237962.pdfIn PDF document text
    • https://site-1048166.mozfiles.com/files/1048166/57197404948.pdfIn PDF document text
    • https://site-1037869.mozfiles.com/files/1037869/64950651822.pdfIn PDF document text
    • https://site-1042720.mozfiles.com/files/1042720/87217640992.pdfIn PDF document text
    • https://site-1036627.mozfiles.com/files/1036627/guler.pdfIn PDF document text
    • https://site-1040264.mozfiles.com/files/1040264/jemagaxija.pdfIn PDF document text
    • https://site-1039517.mozfiles.com/files/1039517/kujinorada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/6946/4727/files/closetmaid_selectives_t4_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1484/8671/files/mayan_chocolate_hallucinogens.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4141/4555/files/ski_boot_liners_salomon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1172/1381/files/fudipugodugizudixiworum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1778/0896/files/dibelisi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000691c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x691C 16988 bytes
SHA-256: 1856c5a8cb14617e248da5f58a54c8667f4148732d7bec2325bedd2f6e7ea7d7
font_01_sfnt_off0000a006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA006 5012 bytes
SHA-256: cc75ebdc90de1d6d4288577fc551d4bcf2325fdf4640a69dbc5d69445eb8ada4
font_02_sfnt_off0000b11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11A 14396 bytes
SHA-256: 580041bff11cf008d433b830834e6bbe8f2d6f78b337434ddabf751798c6b808
font_03_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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