Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a85919865c7096…

MALICIOUS

PDF

43.7 KB Created: 2020-08-15 14:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b067052066936b3762b1660b06ce67ea SHA-1: d727904191b4b40db7cb7cfee193e2f73a63b71e SHA-256: 74a85919865c70960302b47a3bfb8b5d5c6c3b980b88f4326e8c6e0bbf044775
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. One prominent URL, https://ttraff.com/pify?keyword=the+day+after+tomorrow+questions+worksheet, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself appears to be obfuscated or corrupted, but the presence of embedded URLs and the link farm heuristic strongly suggest a phishing or redirection attack.

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=the+day+after+tomorrow+questions+worksheet
    • http://files.thedailydiplomat.com/uploads/1/3/2/6/132695698/zolobu.pdf
    • http://files.thcofe.org/uploads/1/3/1/8/131856757/5215631.pdf
    • http://files.ausdart.com/uploads/1/3/0/7/130739004/5123419.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6702/3253/files/how_to_get_coordinates_in_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/bylaws_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/xawadune.pdf
    • https://cdn.shopify.com/s/files/1/0438/1917/2000/files/define_business_management.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3499/files/51780840786.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6387/files/wiwobukunimibowiza.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/best_to_word_converter_software_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/fopepavofa.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_off00006bd6.bin
ff9290b52d5e3a8bb97cbbfafa13dcf0e8e847e87371e96cc56fd158369e5a52
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD6 5448 bytes
font_01_sfnt_off00007e57.bin
dfd639adc5aba15984f364f0dd1c6876b31733ee9dc3b8015b66554c99acbfd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E57 10472 bytes