Malicious PDF — malware analysis report

Static analysis result for SHA-256 0818494191b61d6f…

MALICIOUS

PDF

80.0 KB Created: 2020-08-25 03:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57a79b0113267a12a98b9acb69dc70de SHA-1: e9a0df39e67de530579ad653b0ae8fbd35af3c06 SHA-256: 0818494191b61d6f301160296dee1bb305b790557da352c9613d8c77dc911ce2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=standard+papierformate+usa'. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated and appears to contain the malicious URL.

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=standard+papierformate+usa
    • http://mudon.lifeinthetumbleweeds.com/uploads/1/3/1/6/131637814/zatul.pdf
    • http://wivuraxup.premiertruckparts.ca/uploads/1/3/1/4/131407408/lapexabuwudenabogaf.pdf
    • http://wativawi.referendumcentral.org/uploads/1/3/0/8/130874250/c9354d84361d58.pdf
    • http://files.ohmog.org/uploads/1/3/2/3/132302872/7451493.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4727/3116/files/3303576138.pdf
    • https://cdn.shopify.com/s/files/1/0434/2461/2508/files/tokepewam.pdf
    • https://cdn.shopify.com/s/files/1/0434/9978/2309/files/farming_in_ancient_egypt_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/3365/5446/files/vapamabuxuxonu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/nokeso.pdf
    • https://cdn.shopify.com/s/files/1/0433/6350/0197/files/nutevoterubanuweboxugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sarexomerowomowubufo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/bamudo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7518/9401/files/narafilepolek.pdf
    • https://cdn.shopify.com/s/files/1/0431/9327/0429/files/heroku_postgres_backup.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce2.bin
fea31fc5949ec4fc51d8dc8aae97931cd190b89c6fdfb1170c5d3f5c1c0d3606		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE2 8592 bytes
font_01_sfnt_off0000d955.bin
a8d7533605cc572264038141bbab08bbf3221831e3c770c8fbe7cdade97a6d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 5256 bytes
font_02_sfnt_off0000eb18.bin
bdb757b31921da5820ac2a6c5734673e81289deecd8f9c6247fb2fb168faed0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 16068 bytes
font_03_sfnt_off00011cb6.bin
adac73dd88a5a13ef13efb485da653fdf085e11bc83e2934f280389a05577f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB6 16216 bytes

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