Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3c2a6340bf06aa…

MALICIOUS

PDF

43.4 KB Created: 2020-11-04 05:50:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0657575343b14714149458b889345f8b SHA-1: 999971273dd2b9027742dbd3bf16481547991688 SHA-256: fc3c2a6340bf06aab8cbe89be2554e1f6b0ee8f11e36af0c511848055cdfa008
154 Risk Score

Malware Insights

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

The PDF contains a link to 'https://gettraff.ru/strik?keyword=apk+keuring+kosten', which is flagged as a malicious redirector. The document also contains a large number of embedded links, many pointing to S3 buckets and other domains, suggesting a link farm or redirection scheme. 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://gettraff.ru/strik?keyword=apk+keuring+kosten
    • https://cdn-cms.f-static.net/uploads/4416144/normal_5f9c26f944dea.pdf
    • https://cdn-cms.f-static.net/uploads/4382187/normal_5f980e9b435de.pdf
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5f9b4a8c80d39.pdf
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5f9ceda9ac3eb.pdf
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f9f573b5793f.pdf
    • https://cdn-cms.f-static.net/uploads/4417675/normal_5f9fab84d9f2d.pdf
    • https://cdn-cms.f-static.net/uploads/4379371/normal_5f95f976c7786.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gurowozenupifi/50285210301.pdf
    • https://cdn.shopify.com/s/files/1/0505/3392/5046/files/relationship_between_curriculum_and_instruction.pdf
    • https://cdn.shopify.com/s/files/1/0431/9192/6948/files/pastoralists_definition_whap.pdf
    • https://s3.amazonaws.com/jebokizez/edgestar_washer_dryer_combo.pdf
    • https://s3.amazonaws.com/xojafemori/watch_frozen_movie_online_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f9a.bin
2f97c0abede3035f63dd20a568ccf84f006b9c56df55253c96739aa861ba1944
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9A 4680 bytes
font_01_sfnt_off00006f9a.bin
ee7cb1ad67fd03fd1310a549349146e652e97e47386c30a90677955b889587b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9A 10388 bytes
font_02_sfnt_off000092e7.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x92E7 4324 bytes