Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50f88187f4b182e…

MALICIOUS

PDF

42.8 KB Created: 2020-08-30 06:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19823066cd0ee59204a7c6ae6e70180a SHA-1: 603147198c8cbaea4f58cc3cdcf13ee143e31cf7 SHA-256: b50f88187f4b182e7a88c5af83c996c31cd2359d9254d38d22416b22cbaf255d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed to improve search engine rankings. One prominent link directs to 'https://ttraff.club/wix?keyword=samsung+hw+km45+review', which is flagged as a malicious redirector. This suggests the document's primary purpose is to drive traffic to malicious infrastructure, likely for phishing or malware distribution.

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.club/wix?keyword=samsung+hw+km45+review
    • https://static.usrfiles.com/ugd/b8c837_82d68c2fe8a948b0bf6390ae701f5144.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2dc94cbac1740c5a09c1362aa8ed58d.pdf
    • https://static.usrfiles.com/ugd/efb3f0_a4d3dbd83ab54369b646d43df249774e.pdf
    • https://static.usrfiles.com/ugd/93c935_b85ae37367154c638e97efb463dcf84c.pdf
    • https://static.usrfiles.com/ugd/b8c837_60789c81462d4bb8a0df1d37f5782e56.pdf
    • https://cdn.shopify.com/s/files/1/0433/6094/4296/files/lute_society_of_great_britain.pdf
    • https://cdn.shopify.com/s/files/1/0432/5035/2296/files/26879464734.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/69673425683.pdf
    • https://cdn.shopify.com/s/files/1/0461/9114/9214/files/top_10_best_hd_movie_site.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/46433593789.pdf
    • https://cdn.shopify.com/s/files/1/0438/0445/9170/files/moparunimixolaru.pdf
    • https://cdn.shopify.com/s/files/1/0432/6935/7728/files/puburawutosaka.pdf
    • https://cdn.shopify.com/s/files/1/0436/1325/7885/files/bonulitotavinapabi.pdf
    • https://static.usrfiles.com/ugd/b8c837_63709972f7bb491fa0b25fc2089647cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_70c3ed30593944dfab658a37850a33e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d27b058bd7d4a179eca478ca04af943.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066a2.bin
45778594ba3a580e60492c5af24dc49cda5da1fca898e94ad78d328fda78623d
pdf-font-stream PDF embedded font (sfnt) at offset 0x66A2 5596 bytes
font_01_sfnt_off00007998.bin
aa35b89eb5921555c9817244216ca88ecdf712d343a1bba6dd0d975aa3a19952
pdf-font-stream PDF embedded font (sfnt) at offset 0x7998 10376 bytes