Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a440aa64eb5e487…

MALICIOUS

PDF

40.2 KB Created: 2020-08-07 15:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26480cac236d1d9496777f0f026d8de7 SHA-1: 3e65e10716c39da62979a57b067c8f42d3dc9d8d SHA-256: 0a440aa64eb5e487d4e821b1b55e35eaeaa85f5605dd7c23a7590366c4ed3331
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links directs to a known malicious redirector, indicating an attempt to lead the user to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=uniformly+accelerated+motion+horizontal+dimension+problems+with+solution+pdf
    • http://xurumog.ctnonline.com/uploads/1/3/1/3/131383483/tuzisiwevobewo.pdf
    • http://gitizota.bellabirth.org/uploads/1/3/1/4/131438477/wofukijav.pdf
    • http://files.smile2340.com/uploads/1/3/1/3/131384771/nikojaxuvupu-texeganev.pdf
    • http://files.hollymoxley.com/uploads/1/3/1/6/131637362/af7c1033aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/6037/5201/files/olivier_blanchard_macroeconomics.pdf
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/type_of_learning_disability.pdf
    • https://cdn.shopify.com/s/files/1/0450/2195/4206/files/oregon_wine_country_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/somilazaki.pdf
    • https://cdn.shopify.com/s/files/1/0436/1266/8066/files/73838015785.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/75830486890.pdf
    • https://cdn.shopify.com/s/files/1/0428/9652/3423/files/english_stories_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/3224/7445/files/647536582.pdf
    • https://cdn.shopify.com/s/files/1/0435/7590/2363/files/88052527879.pdf
    • https://cdn.shopify.com/s/files/1/0434/1347/1384/files/40207680940.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_off00005f4b.bin
bf4b1d5f365fa19ca570b290b3b32431a8a61659e2d9235ea414a4f2b838c301
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4B 5772 bytes
font_01_sfnt_off000072de.bin
2c79f891d967276d2b40600644bcc17b81f74169bf3d4ab62405ce0789cd2b53
pdf-font-stream PDF embedded font (sfnt) at offset 0x72DE 9540 bytes