Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d7708dd2f75bf1…

MALICIOUS

PDF

43.6 KB Created: 2020-08-22 03:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7e8369ac7887ea7fce5c044526b8a7a SHA-1: ba6865aba8d77649a342405a9c91a5dafba5acc7 SHA-256: 72d7708dd2f75bf1443c0eb13d60099d478cea813c49f7a659feceb6ad05b270
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/pify?keyword=quicktime+avid+dnxhd+codec. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external PDF links, one of which is https://cdn.shopify.com/s/files/1/0433/3505/7559/files/perajatitujonitopuf.pdf. The ML classifier also strongly indicated maliciousness. The document body, though partially obfuscated, contains references to the malicious URL and appears to be a lure for a codec download.

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/pify?keyword=quicktime+avid+dnxhd+codec
    • http://files.jbpaoletti.com/uploads/1/3/1/4/131407423/jibopitavizik.pdf
    • http://files.bartlettyearbook.com/uploads/1/3/1/0/131069886/dokabixikarok-zataji-gadupenoxoga-jafejisogetu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/perajatitujonitopuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/0416/4257/files/avantage_comparatif_et_absolu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/how_to_reduce_bullying_in_schools.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/kisepojisuweligel.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/minecraft_repair_and_disenchant.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/dead_frontier_wiki.pdf
    • https://cdn.shopify.com/s/files/1/0436/4930/2693/files/wuzujesunogale.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/32983582660.pdf
    • https://cdn.shopify.com/s/files/1/0440/7332/0600/files/web_designing_course_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7938/files/wovuxalimapirufitabo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/zalilirar.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/article_370_urdu.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_off00006bcf.bin
b664ededa450162041daf823c4cffbbab9b3345110fd2364c49fa4c3c7839f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCF 5128 bytes
font_01_sfnt_off00007d23.bin
8a604c6a400ac5478ba641aa17b0a04114319f3151ace2c3c413cdd8803bd6df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D23 10612 bytes

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