Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f1f374b68f846a…

MALICIOUS

PDF

33.3 KB Created: 2020-08-20 05:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c40d4245497a90df1a5a8d05128e565 SHA-1: a1dfcc3635225ee09d4bba89fdcf2b490444df27 SHA-256: 91f1f374b68f846ab12924d4e3f5eb3de577b97f89caacf7e332237a9d7e2032
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to external PDFs, a technique often used for SEO poisoning or to obscure malicious destinations. The primary malicious link, 'https://ttraff.com/pify?keyword=gusion+guide+for+beginners', is identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=gusion+guide+for+beginners
    • http://files.fnaq.org/uploads/1/3/0/9/130969944/nivubuluro.pdf
    • http://xifepi.mrsthurberhistorycom.com/uploads/1/3/1/3/131380005/2928023.pdf
    • http://files.lifewisegifts.com/uploads/1/3/0/8/130874128/6ab8d3.pdf
    • http://files.puzzle-pieces.org/uploads/1/3/1/6/131606284/4791720.pdf
    • http://worew.cromptonfc.org/uploads/1/3/0/7/130775639/rafatedav.pdf
    • https://cdn.shopify.com/s/files/1/0441/4596/7256/files/free_dictionary_for_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/patologi_klinik_hematologi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/balevogigadan.pdf
    • https://cdn.shopify.com/s/files/1/0437/5796/1374/files/pseudocode_for_loop.pdf
    • https://cdn.shopify.com/s/files/1/0428/7873/0403/files/apush_chapter_6.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3784/files/mezaromunepudoxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8899/3699/files/nexufoxavejiludadalik.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/although_even_though_despite_in_spite_of_however.pdf
    • https://cdn.shopify.com/s/files/1/0438/4758/1856/files/caiib_advanced_bank_management_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/92579140499.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_off000047e0.bin
1b0a5ee19dd33dddea7189bf9a5d24e4384607f4ca2b04380afb7782dce9f866
pdf-font-stream PDF embedded font (sfnt) at offset 0x47E0 5004 bytes
font_01_sfnt_off000058f9.bin
c01773d384ec52c28a345920ff1bee1303cc014a73c28c9b50d75bf5c3acf0a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x58F9 9292 bytes