Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb16590dc750922…

MALICIOUS

PDF

44.3 KB Created: 2020-08-31 09:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f766d38db8ab77175504bb4f58dbd98 SHA-1: 02bfa2a76cc5634ba7abf7479c0e90d54eeb2d8e SHA-256: 5fb16590dc7509221dee02d91c906fb185389a5dc3f749b97adae5c82494b617
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm, likely intended to distribute further malicious content or engage in SEO manipulation for malicious purposes. The primary malicious IOC is the redirector URL.

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/wix?keyword=pokemon+insurgence+version
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/565485_030b06997cfc406cab9916101abc839f.pdf
    • https://static.usrfiles.com/ugd/2f7815_4e7bc1eff6904dda8c5ccb146367cd25.pdf
    • https://static.usrfiles.com/ugd/dc51bb_e12451e2be654ccbaa451b96600c4a14.pdf
    • https://static.usrfiles.com/ugd/defdb4_8eeabdbd94f24d609831e318430515b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_b78f99b4222b4a828ab3645a0b5c9f49.pdf
    • https://static.usrfiles.com/ugd/b8c837_042007822ad24e519d279f0d3604b673.pdf
    • https://static.usrfiles.com/ugd/738632_4a3a64c49a614c1eb5d5658990c8811d.pdf
    • https://static.usrfiles.com/ugd/1f2646_027c078ca0f9495d9e4b72d2d8fb128a.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4992/files/gojelenofesivanutepofura.pdf
    • https://cdn.shopify.com/s/files/1/0445/4980/0100/files/nursing_assessment_process.pdf
    • https://cdn.shopify.com/s/files/1/0434/1750/1853/files/26582920160.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/boney_m_rivers_of_babylon_karaoke.pdf
    • https://cdn.shopify.com/s/files/1/0433/1608/4891/files/livuloniv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3225/6407/files/55843884027.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_off000061e1.bin
0281870f7d742e309089c7f07ae8e41d42586f5aef0b69a05ecc1cc3cdb9fe30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E1 4804 bytes
font_01_sfnt_off0000721c.bin
c60402a6920c22a81d28f699d13936a59140006d3678d99170a57ccc1119c23e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721C 10676 bytes
font_02_sfnt_off00009660.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9660 4324 bytes

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