Malicious PDF — malware analysis report

Static analysis result for SHA-256 852eeea6a145d54b…

MALICIOUS

PDF

35.9 KB Created: 2020-08-20 05:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f3c09efac15e6d3c6e7a330854823d8 SHA-1: c53f95dffa3bd76cfb6ebf2715bfab2586624e25 SHA-256: 852eeea6a145d54ba481117523becfabfa370262954376dde8453ccfc4d6d399
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to Shopify-hosted PDF files, likely as part of a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is designed to lure users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to malicious infrastructure.

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=how+have+you+been+doing+lately+answer
    • http://files.hr-conference.org/uploads/1/3/0/9/130969656/a322e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7085/7124/files/pimowuraguwubidixot.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/bureluxonudunodifonewuvu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1929/5131/files/kosawapirex.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/29254200238.pdf
    • https://cdn.shopify.com/s/files/1/0433/5874/8822/files/zevedolowofuwovuleviva.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/babatesepa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3406/files/ashrae_handbook_fundamentals_1997.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/54877133702.pdf
    • https://cdn.shopify.com/s/files/1/0430/9742/4026/files/68314657174.pdf
    • https://cdn.shopify.com/s/files/1/0430/6619/6122/files/accountancy_class_12_ncert_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9234/files/gaxafibogir.pdf
    • https://cdn.shopify.com/s/files/1/0461/7542/0579/files/70913938894.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/39390632921.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e1d.bin
376a68c37bfbdb6588305efe1d9c6b2e35f1c21ec5ef8285700b58e09246bbb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E1D 5440 bytes
font_01_sfnt_off000060a7.bin
ee53407c230f152d67bd66f90301726d7a295424197523e420a57558d73e231c
pdf-font-stream PDF embedded font (sfnt) at offset 0x60A7 9980 bytes