Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5ea4aff33ffa64…

MALICIOUS

PDF

44.0 KB Created: 2020-09-01 04:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7acaea25c08db60ac31d444bebb66ac0 SHA-1: ee76580615ac1e8cdb9e1d177d52ae60a30a9527 SHA-256: 6c5ea4aff33ffa647b9db492a6034a044fd3cf3a64a2f2c984980a524cf4f9f0
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a known malicious redirector infrastructure, disguised as a crossword answer key. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a social engineering lure to drive traffic to malicious sites, likely for further exploitation or phishing.

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.ru/wix?keyword=guardian+crossword+15314+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/kuzikebuv.pdf
    • https://cdn.shopify.com/s/files/1/0457/7129/2838/files/ncaa_basketball_10_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0433/8407/8503/files/basic_application_of_computer.pdf
    • https://static.usrfiles.com/ugd/b8c837_36333086043b4e07be6b7cde5fc459aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_80c09b72ba0a440abe4c978e1794a1c5.pdf
    • https://static.usrfiles.com/ugd/c63dba_1dc873ab77014e5a97de36f55a174f41.pdf
    • https://static.usrfiles.com/ugd/868401_0aefcb3a54f04f35bcf5908d09bf0f86.pdf
    • https://static.usrfiles.com/ugd/bf0735_1c8159abfc8f482aa23f46452a29dedd.pdf
    • https://cdn.shopify.com/s/files/1/0440/3773/4550/files/sijuposet.pdf
    • https://cdn.shopify.com/s/files/1/0438/9080/2856/files/boripewotivozuvorumevebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2119/files/biology_science_for_life.pdf
    • https://cdn.shopify.com/s/files/1/0432/5123/7022/files/bohemian_rhapsody_fingerstyle.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_off00006d96.bin
907c42420c9bc0ea60b94461416235e55786d6be804c34621d7b2c94b20ca2ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D96 5452 bytes
font_01_sfnt_off00008050.bin
9641ebd114aeae3ec0cc24388cdbd58c9e3af431ae73f1ad22c606bda9bf1c04
pdf-font-stream PDF embedded font (sfnt) at offset 0x8050 10192 bytes