Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c65b23a2f6adf63…

MALICIOUS

PDF

40.7 KB Created: 2020-10-31 03:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f3d5f52b2598ca78849efa8ce309df7 SHA-1: 08d9ce71c80c629e2b71a3304dbec5d023f313eb SHA-256: 6c65b23a2f6adf636775a451dd9193a6913c99e128ac582c93071e0cee743ad5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various platforms. The primary link, 'https://cctraff.ru/pify?keyword=super+su+apk', is identified as a malicious redirector. This suggests the document is designed to funnel users through a chain of links, ultimately leading them to potentially malicious content or malware downloads. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/pify?keyword=super+su+apk
    • https://rukutatonaneto.weebly.com/uploads/1/3/4/0/134012616/wuwawemakegag.pdf
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/kolasebujowifex.pdf
    • https://cdn-cms.f-static.net/uploads/4386086/normal_5f8d44512fb9c.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/ritikitiwokej.pdf
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/dojaxudegozefu.pdf
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f8bc557175ef.pdf
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/bewidonido_kapudoxozipi.pdf
    • https://jetizapu.weebly.com/uploads/1/3/4/3/134371104/4371084.pdf
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f8911b5ce631.pdf
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/0a6997746.pdf
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f927fb8b154c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0268/8906/0551/files/sistema_oseo_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0499/1290/5886/files/57766911147.pdf
    • https://cdn.shopify.com/s/files/1/0483/9732/0350/files/lujidekufo.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_off00006046.bin
79efcccb8cffb5b938172119e2ed24a5be53a8cf5a38bd56288c6d6c647195fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6046 4948 bytes
font_01_sfnt_off00007124.bin
fc21d52d03aa5e34987c482ce15ece18a2212ab8b16ee73b5657d79b9a324d7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7124 11012 bytes