Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a0a92c30353ab3…

MALICIOUS

PDF

52.5 KB Created: 2020-08-15 14:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc75f3e0d17cad7a555d0898cf2addac SHA-1: 18a03c737172a7ea33b4643bf0650792b5b8da49 SHA-256: 81a0a92c30353ab3ad10724c4fb389919de01e6221876becc4a8c68618e67e41
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominently pointing to a known malicious redirector. The document body, though heavily obfuscated, includes the same URL, suggesting an attempt to trick users into clicking it. The ML classifier also strongly indicated maliciousness. The presence of multiple PDF links, many pointing to Shopify, suggests a link farm used for SEO poisoning or distributing malicious content.

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/wb?keyword=new%20testament%20ancient%20greek%20pdf
    • http://kekukim.luco.org/uploads/1/3/1/6/131606758/lenoxesu.pdf
    • http://resivigex.lllofwi.org/uploads/1/3/0/8/130874431/9333798.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/rufewebibonurubekikobu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/turojug.pdf
    • https://cdn.shopify.com/s/files/1/0432/5113/8715/files/libro_quimica_inorganica_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0437/3171/4202/files/4748978806.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/el_almohadon_de_plumas_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1159/files/gugugiseboved.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9817/files/enter_sand_man_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/lawodul.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/8310630395.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/kakapusiwiximagozamozat.pdf
    • https://cdn.shopify.com/s/files/1/0437/8011/2545/files/18363241670.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_off00007c6d.bin
8d5e099a71b31f860cc5125deb311b3ec006831567d5681e434413dd25b3c379
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6D 5568 bytes
font_01_sfnt_off00008f5f.bin
10a84d721e3298a5fe802a164b00983f5ac76b7a978eb185debfc1281ad00011
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5F 21768 bytes