Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c962c738aae1b48…

MALICIOUS

PDF

38.3 KB Created: 2020-08-06 03:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b067dce2598fa526f77e88cb0c920206 SHA-1: fc28e2651783979a6f6352ef6ee2818b013ad5b4 SHA-256: 6c962c738aae1b48f5eace896f7e4592d641e95fcf9433f4360d10d91aaf8584
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. One prominent URL, 'https://ttraff.com/pify?keyword=an+inspector+calls+questions+and+answers+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is intended to lead 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=an+inspector+calls+questions+and+answers+pdf
    • http://files.distantseasministries.com/uploads/1/3/1/4/131452735/7e3d3f20.pdf
    • http://zumala.lamotteviolins.com/uploads/1/3/2/7/132710712/vumuxajanidami.pdf
    • http://files.travelingnurses1.com/uploads/1/3/1/3/131378771/5969702.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8670/8893/files/toxoplasmosis_gpc.pdf
    • https://cdn.shopify.com/s/files/1/0431/2141/0210/files/45843803705.pdf
    • https://cdn.shopify.com/s/files/1/0431/6545/0389/files/ajax_download.pdf
    • https://cdn.shopify.com/s/files/1/0443/0381/0716/files/alfred_adler_theory.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3117/files/wifejisefulalojojejikopuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/1311/0951/files/august_2020_current_affairs_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/toritekeziwel.pdf
    • https://cdn.shopify.com/s/files/1/0439/7082/2302/files/features_of_globalisation.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/88804616770.pdf
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/georgia_drivers_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/38669125157.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/1-_99_magic_rs3.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_off00005448.bin
7f17ae249f966580561bac5c0ee774f5c4e881bba9926243ad9317a75db2ce87
pdf-font-stream PDF embedded font (sfnt) at offset 0x5448 5356 bytes
font_01_sfnt_off00006698.bin
14f1359ddb014b3d3fa31d8decb958350d1019a8ad2ecdc8c418af07a15ebb70
pdf-font-stream PDF embedded font (sfnt) at offset 0x6698 11452 bytes