Malicious PDF — malware analysis report

Static analysis result for SHA-256 1926c7b7ea84f147…

MALICIOUS

PDF

37.7 KB Created: 2020-08-12 17:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7c94ad310bef9965ccf9947713de9dd SHA-1: b4afdf9da5d87962f2ba3b5106bdd3465873ea61 SHA-256: 1926c7b7ea84f147f3ff9322cccad3cde5c6c1952da1b2f3b069f738c4d75936
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to other PDF documents, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://ttraff.ru/pify?keyword=canasta+b%25C3%25A1sica+y+calidad+de+la+alimentaci%25C3%25B3n+en+m%25C3%25A9xico+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself contains garbled text and some of the URLs, indicating it's not intended for legitimate user consumption.

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=canasta+b%25C3%25A1sica+y+calidad+de+la+alimentaci%25C3%25B3n+en+m%25C3%25A9xico+pdf
    • http://files.armenianchurchofaustin.net/uploads/1/3/1/4/131438567/4212295.pdf
    • http://files.allenpc.org/uploads/1/3/1/4/131437532/temukalugag-numogagix-faxuwipatojilu.pdf
    • http://files.jordydeleon.com/uploads/1/3/2/6/132696558/e648132db.pdf
    • http://files.accountinguci.com/uploads/1/3/0/8/130873907/wafizelov-josekijaze.pdf
    • http://kumuwujiv.bleakhilllincolnlongwools.com/uploads/1/3/0/8/130814297/3580559.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6259/9583/files/4438896869.pdf
    • https://cdn.shopify.com/s/files/1/0437/4626/3201/files/dikezasanelebudizamivu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1174/files/brain_teaser_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/ufc_gym_sacramento.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/8736613660.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/18593414232.pdf
    • https://cdn.shopify.com/s/files/1/0443/1645/9164/files/what_s_so_amazing_about_grace_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5879/8492/files/godiden.pdf
    • https://cdn.shopify.com/s/files/1/0433/8047/4014/files/effect_of_online_advertising_on_consumer_buying_behaviour.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/60856100333.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5445/files/lugifepenisuwu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1977/8720/files/dozajatubenamafa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/66620595534.pdf
    • https://cdn.shopify.com/s/files/1/0434/3631/0678/files/juwexuxadikabuni.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_off000051c6.bin
c0660cf9d9a65378bf3790fe7d804b68f6f70f7f4ee965fdd1eb7f137d31d88b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51C6 5932 bytes
font_01_sfnt_off000064c6.bin
67064dd90bacceb9d9555369bc3571d2d0e10bf79acf40e77d6ffe6552bfab2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C6 10280 bytes

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