Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd8872a86cae1f8…

MALICIOUS

PDF

46.7 KB Created: 2020-10-25 14:08:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 517b252cd03060db744bc32d09a3fd24 SHA-1: 717ff6a201c1d0aac1b2f6f1d4e9250994b04c9e SHA-256: 0fd8872a86cae1f8801faa16cbde931f3c715c7ff006b59c828af10e0e45612d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and a link farm. The ML classifier also flagged this PDF as malicious. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites, masquerading as a document related to 'apk air fighter pro'. No scripts were extracted, but the presence of numerous links indicates a strong intent to direct users off-site.

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.cc/123?keyword=apk+air+fighter+pro
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/jajixakopokeru-zebosaw-xosevuzid.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rotesojelunemiroto.pdf
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/7037811.pdf
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/balibusoxuriduze.pdf
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/0f6314c9aeca.pdf
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/4156737.pdf
    • https://ganizosu.weebly.com/uploads/1/3/4/4/134434359/09d2c41ad.pdf
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5f8b62b264bff.pdf
    • https://cdn-cms.f-static.net/uploads/4385198/normal_5f8d746c7a76f.pdf
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f9452a7aa62a.pdf
    • https://cdn-cms.f-static.net/uploads/4388813/normal_5f92df197d866.pdf
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5f8de2c4ba8b5.pdf
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f874445c243b.pdf
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f870c4f8c4f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/86137826-da27-4c57-9829-36b651690882/wosifujida.pdf
    • https://uploads.strikinglycdn.com/files/e7b3a534-50e5-4b01-9fde-511f58532ab3/sisipumolif.pdf
    • https://uploads.strikinglycdn.com/files/81be5a24-c51f-4d6c-a438-56a0a371e391/sixewivadapedu.pdf
    • https://uploads.strikinglycdn.com/files/d6c26dad-1480-47c2-ba3f-57a5a1d15e8c/zezatusowanodamoxapura.pdf
    • https://uploads.strikinglycdn.com/files/9ac3ac2e-d7ff-49db-b149-61df8c5e2ae0/zopog.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/kinakuxilegoxuzexuz.pdf
    • https://cdn.shopify.com/s/files/1/0439/1370/7688/files/chromatin_condenses_into_chromosomes_during.pdf
    • https://cdn.shopify.com/s/files/1/0483/8696/5672/files/geometria_plana_y_del_espacio_rodo.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_off0000768f.bin
8233fce4dc2c18e0c459667ddeaf884522045ff4fed2f2699185d3d71f6f9719
pdf-font-stream PDF embedded font (sfnt) at offset 0x768F 5004 bytes
font_01_sfnt_off00008794.bin
dec0b65f1974cf8a9639066ade796e5883c0fd899f914cf5862130d070b785a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8794 11084 bytes