Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbce33bdb9524dc…

MALICIOUS

PDF

56.7 KB Created: 2020-08-08 16:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa43cbfbbead99471d4ef19eb4027987 SHA-1: 2c9512fa6e9b6e8f0143b7edabf5fc9f7ff630e1 SHA-256: 6bbce33bdb9524dcbd85119b9013695f5d3c91af74edf63d860d626010554283
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=chaos+knight+40k+pdf'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many of which are also PDFs. While no scripts were extracted, the presence of a malicious redirector strongly suggests an attempt to lure users to a malicious site, likely for further exploitation or phishing. The ML classifier also flagged this PDF with high confidence.

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=chaos+knight+40k+pdf
    • http://files.progressivenewsradio.org/uploads/1/3/1/3/131398547/fodewavixole_xiwadilu_votitavipaloro.pdf
    • http://doniz.yogainthelibrary.com/uploads/1/3/0/7/130775062/minevuxumoteduduk.pdf
    • http://files.tlscco.com/uploads/1/3/0/8/130813458/moxeji-rifewifidimufo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9925/1097/files/antonio_guzman_blanco_biografia.pdf
    • https://cdn.shopify.com/s/files/1/0433/7028/3166/files/9571019250.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/9752055868.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/password_protect_file_adobe_reader_dc.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/31138699405.pdf
    • https://cdn.shopify.com/s/files/1/0429/3964/6108/files/zolagofepebup.pdf
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/tezolafetimotetuxubaziwus.pdf
    • https://cdn.shopify.com/s/files/1/0437/0297/6666/files/medicinal_chemistry_alagarsamy_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/korizazegonifig.pdf
    • https://cdn.shopify.com/s/files/1/0430/2913/5521/files/fetal_drug_metabolism.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.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_off00009fe8.bin
590f85c36d520bf049dbae2b8a23c0dfba5b2657f3bcda7041089cba95e5a84b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FE8 5372 bytes
font_01_sfnt_off0000b233.bin
ab0f8fd0000874b19038800f3347a3fd45eefc18768a0dc9bc1cbb34143fa90d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB233 10416 bytes

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