Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f23a2741dd0885…

MALICIOUS

PDF

32.6 KB Created: 2020-08-10 06:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aff8a6018f272c75230003de9bf8fc13 SHA-1: 7aecd22058407b42efc7b656a67ecc9a7f869243 SHA-256: 84f23a2741dd0885f73a23842f30ea78553073612f8050d05336c4f22298065f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, disguised with a lure related to "Spider-Man comics online PDF". The document body also contains this URL, along with numerous other links to PDFs hosted on Shopify and other domains, suggesting a link farm or SEO poisoning attempt. The primary malicious URL leads to a redirector, likely to serve a second-stage payload or phish credentials.

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=spider+man+comics+online+pdf
    • http://pusikan.tinytotsauburn.com/uploads/1/3/0/7/130776499/luxefikaz_desikikogokevu.pdf
    • http://files.thedermaldevils.com/uploads/1/3/1/4/131410479/4e5206.pdf
    • http://files.stjohnstmary.org/uploads/1/3/1/6/131637570/1479775.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/9442/3192/files/62879893469.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1687/files/sizoki.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/thinking_in_java_github.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6293/files/starbucks_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9617/files/vargeet_jai_ii.pdf
    • https://cdn.shopify.com/s/files/1/0434/8428/3033/files/13852682726.pdf
    • https://cdn.shopify.com/s/files/1/0434/4460/0999/files/pomakijasovosoxogur.pdf
    • https://cdn.shopify.com/s/files/1/0438/1350/3133/files/46802220191.pdf
    • https://cdn.shopify.com/s/files/1/0432/6912/8354/files/nebejifi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7361/8599/files/59085619729.pdf
    • https://cdn.shopify.com/s/files/1/0439/7858/8318/files/antecedentes_de_la_administracion_publica.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_off00004344.bin
7fd34279ba29c8d29e1c10fe96ebb4b5a3cc7baa98e47b9f391e15fa0a3a4e97
pdf-font-stream PDF embedded font (sfnt) at offset 0x4344 5404 bytes
font_01_sfnt_off00005589.bin
531a6409af4cf5298750e38ab23a5a53f4044300bcb3352a85c6acb381fffb6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5589 9540 bytes