Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38b5f6502226dae…

MALICIOUS

PDF

49.7 KB Created: 2020-09-01 19:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88487cc2bc66e86db081627aa22f920e SHA-1: f67b8537d81b4185c7791955b32ace27df503954 SHA-256: a38b5f6502226daee450e1898714f1c19c9f10bb4c441e59e4779bab3369c639
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure via the URL https://ttraff.club/wix?keyword=bio+essence+snail+sheet+mask+review. The document body, though heavily corrupted, contains fragments of text related to product reviews and the malicious URL, suggesting a lure to a phishing or malware distribution site.

Heuristics 3

  • 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.
  • 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=bio+essence+snail+sheet+mask+review
    • https://cdn.shopify.com/s/files/1/0432/5657/8206/files/pozetizalagetinomakep.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/wijepigarukoru.pdf
    • https://cdn.shopify.com/s/files/1/0436/6771/8309/files/34772380528.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0093/files/95405279035.pdf
    • https://static.usrfiles.com/ugd/09c3c7_308b4059bfff47a5ae44bdf5feb337ed.pdf
    • https://static.usrfiles.com/ugd/60933b_4b5a24ee8d314cbb878a260365d8a73b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4f5c05297f64a5492764d46a5aab4c9.pdf
    • https://static.usrfiles.com/ugd/9e53d4_186f1492969b4faaa5d863a60733ba5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_770bf3c3d14943f8bd9de74929a16c86.pdf
    • https://static.usrfiles.com/ugd/0f5b72_c17d1d303e644459a6206e424c9ef8ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a745e7b5bce49218425f295abe35c3d.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/physical_science_grade_11_study_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/learn_java_the_hard_way.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073ae.bin
42ffec2e60aff95afc73db5d770646357bcbc4ea305b1dcdb6f3085bac593b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AE 5092 bytes
font_01_sfnt_off000084c9.bin
7958b7b163bc58030d00d694fb1e7f663221974cd340ebfcf446bc254eb34baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C9 12328 bytes
font_02_sfnt_off0000abf9.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABF9 4324 bytes

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