Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cde57dec02f780d…

MALICIOUS

PDF

33.9 KB Created: 2020-08-20 22:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca2ccd9ef603fcd5cc1d86ea9cefbafb SHA-1: d0657a474c74e625c67330758df77ec3c71b3bee SHA-256: 8cde57dec02f780d976000da980a39168bd7639edd4a356c025ec85532856ed8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with one URL specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=go+math+grade+7+textbook+answers', which is likely intended to lure the user to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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=go+math+grade+7+textbook+answers
    • http://files.twocarpentersconstruction.com/uploads/1/3/0/8/130873895/xuvodobisedozu.pdf
    • http://files.anticamodern.com/uploads/1/3/0/8/130814601/88e0183ee.pdf
    • http://files.jamesgrigg.com/uploads/1/3/0/7/130739490/8645743.pdf
    • http://files.victoria13gla.ca/uploads/1/3/1/0/131070722/4c117c.pdf
    • https://cdn.shopify.com/s/files/1/0449/8161/6808/files/armenian_power_spell.pdf
    • https://cdn.shopify.com/s/files/1/0433/6133/7494/files/7168365079.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/tidudosifisitudaloxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/android_assets_file_write.pdf
    • https://cdn.shopify.com/s/files/1/0430/4030/9402/files/sunorimemuzafas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/kijowedanedatesubugube.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdf
    • https://cdn.shopify.com/s/files/1/0438/6376/9243/files/tosopokikakujurolugan.pdf
    • https://cdn.shopify.com/s/files/1/0435/7698/3713/files/kuxoritifeweluzujememo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1474/1413/files/balunga_toka_film_all_song.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9906/files/guladojokurulisanaj.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004540.bin
9a08e7e840ac439c6bc321549a309133ffa6add0b6345726cd5e02c1bc5acdf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x4540 5684 bytes
font_01_sfnt_off00005890.bin
43727ed726d94576beaa3285186308bca687427f49b9f3cd481b2a6efbef72ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x5890 10060 bytes