Malicious PDF — malware analysis report

Static analysis result for SHA-256 649f6883b1ca2460…

MALICIOUS

PDF

48.7 KB Created: 2020-09-11 01:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 011f41a2e368688f2ea0eb4c3f93527e SHA-1: 9dace6081c41084bfd7ed2e770f73b118983f9a6 SHA-256: 649f6883b1ca24602fff76d4b95cd3f9ca114bed4b7ef96223e95909dd367761
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful sites under the guise of providing academic essays. The ML classifier also strongly indicated maliciousness.

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.cc/wb?keyword=jonathan%20franzen%20essays%20pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0463/0708/2402/files/papapedapizapatap.pdf
    • https://cdn.shopify.com/s/files/1/0441/2204/6616/files/25128674754.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7473/files/assassin_s_creed_origins_cheat_engine.pdf
    • https://cdn.shopify.com/s/files/1/0433/5743/8101/files/que_es_cetosis.pdf
    • https://cdn.shopify.com/s/files/1/0438/6465/3984/files/template_blog_html5_responsive_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8241/files/29138292753.pdf
    • https://static.usrfiles.com/ugd/4b7290_cbb70f44e77840558d5d48ead4bdb053.pdf
    • https://static.usrfiles.com/ugd/724fb5_70767723ced24ddc8181eed68327ee5c.pdf
    • https://static.usrfiles.com/ugd/e4a001_76c7cf520eac414da0349929559ae333.pdf
    • https://static.usrfiles.com/ugd/4117a9_47a3e7ed4de54307893310ef4b68e313.pdf
    • https://static.usrfiles.com/ugd/865d50_f3a3c8ec5cb04653aa83611da989e6c9.pdf
    • https://static.usrfiles.com/ugd/f46427_95623700c2574272a9b2e0354542b666.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074f9.bin
d7d6179dd7b31170e6d89c41111c3cafcd011ad9cbf9414717a6eda2a0718586
pdf-font-stream PDF embedded font (sfnt) at offset 0x74F9 4980 bytes
font_01_sfnt_off000085e5.bin
d2debf0d52f47da693816ad0bd0b27c2a20728173a3ce19fd0b3971cfb185d2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x85E5 10076 bytes
font_02_sfnt_off0000a85c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA85C 4324 bytes