Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9e1b5bd5b1dc44…

MALICIOUS

PDF

41.8 KB Created: 2020-08-31 01:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b1a35e2439c150ab653e94bb7565600 SHA-1: bc44b0b64a862a1351fc8391c13a21e8d59ae486 SHA-256: 5b9e1b5bd5b1dc44cdc15c79c25bc6367c3b98325aa51278748c27584ab27fc5
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, https://ttraff.cc/wix, which is likely used to distribute further malicious content or phishing pages. 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/wix?keyword=tipo+de+material+del+vidrio+de+cal+sodada
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/8466/9088/files/kanji_look_and_learn_workbook_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/15000_useful_english_phrases.pdf
    • https://cdn.shopify.com/s/files/1/0434/2425/2055/files/57230283464.pdf
    • https://cdn.shopify.com/s/files/1/0429/2119/7724/files/46783528315.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/libro_aprendiz_de_brujo_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/96326003896.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/babigazawom.pdf
    • https://cdn.shopify.com/s/files/1/0461/7820/5850/files/14163114698.pdf
    • https://cdn.shopify.com/s/files/1/0434/3808/0167/files/chennai_express_songs_video_hd_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/5964/1496/files/15211732284.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5125/files/41557793955.pdf
    • https://static.usrfiles.com/ugd/822ecd_95862999b248458b8d166c07d9bacae8.pdf
    • https://static.usrfiles.com/ugd/2f7815_2fee0193cde54d17b0cf3b9efaf927bf.pdf
    • https://static.usrfiles.com/ugd/599f1c_a4c84b138f96479294605d6288c30178.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_61059274e5a94cb680b46bf5d83a7f48.pdf
    • https://static.usrfiles.com/ugd/b8c837_e457ef8d9ca54f368d538eec07eb97c9.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_off000063ea.bin
fba54368f2e84bb22ffdbdd483f1ba4df9a7c9aef401d8124e577da3cd782975		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EA 5228 bytes
font_01_sfnt_off0000759b.bin
21806eef37a0c9145971a2261d0f182ef72cddf283652ab6941bb88b4d4a1ddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x759B 10964 bytes

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