Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ccd66a15ec72de…

MALICIOUS

PDF

40.9 KB Created: 2020-08-12 21:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21cf78944eda883d9b9d146238ad7d77 SHA-1: f1405e10513433aaaf774ed2d2202158421e48b1 SHA-256: 28ccd66a15ec72deea0c0011e906b981ef301d34ad1b33576bd14e646235bdf2
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, forming a link farm, with a primary URL pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and appears to contain the redirector URL, suggesting a lure to a malicious site.

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.com/pify?keyword=cedaw+pdf+francais
    • http://files.bethelemc.ca/uploads/1/3/1/4/131406140/tepoviletozo_femusi_zikibizaxupudu_dakamakikoso.pdf
    • http://sunopir.bizsupportservices.com/uploads/1/3/2/3/132302921/793048.pdf
    • http://files.eastafricanscholarsfund.org/uploads/1/3/0/8/130874284/rirate.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2905/files/juzokadofolirazuxekope.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/bakatofepirizewokarivovun.pdf
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/47127581307.pdf
    • https://cdn.shopify.com/s/files/1/0435/1403/6376/files/argala_stotram_meaning_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0441/0019/0360/files/fidugajig.pdf
    • https://cdn.shopify.com/s/files/1/0428/2204/1767/files/nipawugudokami.pdf
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/xizamejupuregelixotufoga.pdf
    • https://cdn.shopify.com/s/files/1/0434/0600/0282/files/imaginative_writing_burroway.pdf
    • https://cdn.shopify.com/s/files/1/0437/1097/2056/files/19140994631.pdf
    • https://cdn.shopify.com/s/files/1/0437/3220/5722/files/17824893944.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8372/files/30443707088.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063b5.bin
775591517b7666f5b188d3cf34694e94f19fa2cc506e75ad42cdab198fee610f
pdf-font-stream PDF embedded font (sfnt) at offset 0x63B5 5112 bytes
font_01_sfnt_off0000753c.bin
9cb7e7fbc827bf91390d3bafa7fa78808bbe3ac221eb53661758523cf2228890
pdf-font-stream PDF embedded font (sfnt) at offset 0x753C 9992 bytes