Malicious PDF — malware analysis report

Static analysis result for SHA-256 662f55fddde42d24…

MALICIOUS

PDF

44.0 KB Created: 2020-08-16 20:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b4825f4cfaf1da92180713a8b9c102a SHA-1: 86613b43ea1675745400a62593d742365d2d8830 SHA-256: 662f55fddde42d245b411548aae3d553178864d50a958941f3a5eada1afba6fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to link farms or redirector services. One critical heuristic indicates the PDF links to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The embedded content, though heavily obfuscated, appears to contain URLs that are part of a link farm strategy.

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=tennis+game+ps4
    • http://files.pound4poundathletics.com/uploads/1/3/0/8/130813841/dokawil.pdf
    • http://files.steadfastanimalsolutions.com/uploads/1/3/1/3/131383630/9911318.pdf
    • http://files.baumcycles.com/uploads/1/3/2/6/132682171/9640449.pdf
    • http://files.closeencountersadventures.com/uploads/1/3/1/4/131453674/6395585.pdf
    • http://files.positivebirthlbc.co.uk/uploads/1/3/1/4/131437724/nixajasuwu_domamekirab_zevizarimow_boruzatumuzufa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/50434758207.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1660/files/85992667470.pdf
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/childrens_cardigan_knitting_patterns_to.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/nacionalismo_mexicano.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/jovenetipegasiloxupuxewu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7537/0136/files/lagibekebilibapo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/atm_card_block_application_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/kufusuwazoxovumuliwaxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4487/2085/files/angular_datepicker_directive.pdf
    • https://cdn.shopify.com/s/files/1/0432/3219/8816/files/90838507927.pdf
    • https://cdn.shopify.com/s/files/1/0428/6650/7942/files/41901475176.pdf
    • https://cdn.shopify.com/s/files/1/0429/0206/1215/files/biogas_benefits.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/pemugududiwulujurozit.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_off00006248.bin
4bc69691dcd228d1a46bbf168bfdaf2d56a95aa75ef2680b5ed5d6a0f5b38a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6248 4648 bytes
font_01_sfnt_off000071ef.bin
aa8d1a37fd2687ac3b68a0930b146e376201cac505a759e18135f37206632530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71EF 10372 bytes
font_02_sfnt_off00009537.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9537 4324 bytes

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