Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1d62cbf590805e…

MALICIOUS

PDF

41.8 KB Created: 2020-08-03 11:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38cfd185a2668a0a25b38814324833ee SHA-1: 77fa87d5ea10934809dd878bfae247bb20421aca SHA-256: 6f1d62cbf590805e33e608551f9d435fb2f6df27de96eab4c07d951526d49ea5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to create a link farm or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful sites.

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=jet+engine+pdf
    • http://files.meganadutta.com/uploads/1/3/1/4/131437770/jusiluse.pdf
    • http://files.htwindermere.org/uploads/1/3/0/7/130775649/jaduwemesepesu.pdf
    • http://files.johnorlandfurniture.com/uploads/1/3/1/1/131163635/palumenesomo_jirafavumulo_dagamepulur_vawot.pdf
    • http://files.basicbibleguide.org/uploads/1/3/1/4/131406211/4357668.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/88560433160.pdf
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/58039930469.pdf
    • https://cdn.shopify.com/s/files/1/0437/2758/5430/files/34826828545.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/xolexomonuxafupubo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8092/2789/files/sam_s_club_newport_news_va.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/10641600418.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/5994/files/fowekejujomamux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/movikulewerudazuxedo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/werazapasolasosaluz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7138/files/regisa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/zedokodanidorere.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_off00006720.bin
c85ee899f69fdef7c286970300085fcf17a12f5007f97df25c4424a7a065245b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6720 4684 bytes
font_01_sfnt_off0000772f.bin
f403fad75205665430783ff69f8fbc21b8862253452fa2c40b2d00290f9c89f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x772F 10340 bytes