Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5b611e3ae3f72b…

MALICIOUS

PDF

44.1 KB Created: 2020-08-31 23:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 011f8b1b9dada9f619e326ac07ab1c1e SHA-1: b05701fea6c011c00735cc16bd5d01d4bf2440d0 SHA-256: 0f5b611e3ae3f72b4ea3200e6bfe157fbe7bfe5df2381d90ff2f38f7816c9917
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result for a game, which redirects to a known malicious URL. The document also contains a large number of links to external PDFs, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to trick users into clicking the malicious link.

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/wix?keyword=hungry+shark+unlimited+everything+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8fbd7408486747099e70b2d12ebee26c.pdf
    • https://static.usrfiles.com/ugd/3de8a6_300e85fdb5dc42b1b8c300f95e4040aa.pdf
    • https://static.usrfiles.com/ugd/173616_3b09f007f4b64777900374671879bfb4.pdf
    • https://static.usrfiles.com/ugd/221f3a_3a804cbac097486ca040f91e1c4fb912.pdf
    • https://static.usrfiles.com/ugd/1be480_fc9abe4878b841f1ba0574aef0e00ba6.pdf
    • https://static.usrfiles.com/ugd/e3c460_079d9118df464fcca6dacd923e31b8d8.pdf
    • https://static.usrfiles.com/ugd/764aaa_c512af776c3f4b57b73991f90f1acfa5.pdf
    • https://static.usrfiles.com/ugd/b8c837_77ca199deae448acbbea2621e45f71ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9df642da5774e1194a80f0934fb8a8b.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/advantages_and_disadvantages_of_social_networking_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/mipuxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/77289078024.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/pulse_width_modulation_and_demodulation_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/46194767307.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_off00006d0b.bin
84888ed63c5f0b25c5d60b08a036aeda182c81c88b59f1c5b41ed46a4f3c2935
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0B 5560 bytes
font_01_sfnt_off00007fdc.bin
ba889b9a0aa8bbce92f97533c2b0030d868affca2ad36798becb722590e58c06
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDC 10376 bytes