Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9b6f1b414d38e5…

MALICIOUS

PDF

43.5 KB Created: 2020-08-09 02:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa6be36e324c128241de1f2c6056ee16 SHA-1: 2d132042d9b6c4a6ad3d839609156a002c3ca199 SHA-256: 5c9b6f1b414d38e564c924b8686cc48c79f02c388eb33f6fa9d1dc4603c7328d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=barista+skills+foundation+pdf
    • http://xefijajod.colthropmanor.co.uk/uploads/1/3/1/8/131857631/f77dd.pdf
    • http://javijig.xmmphoto.com/uploads/1/3/0/7/130775971/40f7cc6aef17a.pdf
    • http://files.ethnictails.com/uploads/1/3/0/7/130775859/bilisudufojipe-sapawununamiw-tatawuzodij-jixid.pdf
    • http://files.leilaalves.com/uploads/1/3/2/6/132683173/nusibepa_sifab_gofofig_vifepuwoxevi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5592/2856/files/gorasazipazonu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/nilefivijivazudolosekofok.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2133/files/dugexezidosu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2408/0282/files/82432359252.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/vinad.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/bivinovejosakosiwubotimu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9123/7791/files/integration_by_parts_definite_integral.pdf
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/14819229381.pdf
    • https://cdn.shopify.com/s/files/1/0448/1715/4208/files/cutting_edge_upper_intermediate_student_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5457/0399/files/nulujiwulenanofozitejomo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8236/files/armello_explode_pool.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86372263330.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_off00005fb3.bin
4d5d84f751b1babbf810bb0744bac01d3eea055d61559692b03559472a47c1f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB3 4912 bytes
font_01_sfnt_off0000706b.bin
9342bb67e0760905ca5fb7e7fc14562150047fec291e5a88e0b500a379d1331c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x706B 10120 bytes
font_02_sfnt_off000092fe.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92FE 4324 bytes

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