Malicious PDF — malware analysis report

Static analysis result for SHA-256 6059309d76fd9b55…

MALICIOUS

PDF

63.9 KB Created: 2020-08-26 02:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7427dd858d42f7f88739b9e83c014d2 SHA-1: 5f7d4542c508e2c433fb1e49214fe9c80de160e1 SHA-256: 6059309d76fd9b55344993912ad8419fd6eb1e72b32f8b913839aebc4e56f894
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirectors or link farms. One prominent URL, 'https://ttraff.ru/pify?keyword=florianopolis+travel+guide', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other benign-looking PDF files hosted on Shopify, suggesting a deceptive lure. 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.ru/pify?keyword=florianopolis+travel+guide
    • http://files.spreeaad.com/uploads/1/3/1/4/131408942/genagobanomef-jimuwu-vulixuwakuwapo.pdf
    • http://sevelut.lifewithsqueaky.com/uploads/1/3/0/8/130873822/aecfacbc24e4ff.pdf
    • http://files.hilltowngrazers.com/uploads/1/3/1/3/131380337/76290090d0f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5049/2316/files/dojilugekigogovilina.pdf
    • https://cdn.shopify.com/s/files/1/0435/2367/0176/files/sbi_corporate_credit_card_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/13443843715.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/gojoxubulujuwamusidel.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/42991537300.pdf
    • https://cdn.shopify.com/s/files/1/0429/6084/7004/files/brown_bear_brown_bear_what_do_you_see_book.pdf
    • https://cdn.shopify.com/s/files/1/0446/6386/5497/files/assessing_reading_fluency.pdf
    • https://cdn.shopify.com/s/files/1/0433/8237/4561/files/3010682294.pdf
    • https://cdn.shopify.com/s/files/1/0433/2158/9913/files/86488334162.pdf
    • https://cdn.shopify.com/s/files/1/0439/9982/1982/files/valvulas_ksb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a3ac.bin
c59f7f4de3ede80ed4ce2b0747e6608fb957308fd12cf1e4682d24293fb48f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3AC 5144 bytes
font_01_sfnt_off0000b539.bin
7a1d1153eedc489ed6a8b4063317656077d52fa863b32dc9212318b8399f6902		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB539 10732 bytes
font_02_sfnt_off0000d9ee.bin
bf1ad0fe54dce6f40c52dfb50e96d6a95b95fe3cc947bd7b7a664e848b989120		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 17184 bytes

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