Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4a7788ecfff8d0…

MALICIOUS

PDF

52.3 KB Created: 2020-10-07 01:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 50f1f393e8057344fe8a693732a0762d SHA-1: f6046aac7306c70e133be60c288f76201a2b183e SHA-256: 3a4a7788ecfff8d0404bad7744245196504e40064ceb4244bc094cb76116126a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with heuristics indicating it's a link farm and a redirector to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs, such as https://cctraff.ru/strik?keyword=vocabulary+words+pdf+for+ssc, are likely used to drive traffic to malicious sites or for SEO spam.

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/strik?keyword=vocabulary+words+pdf+for+ssc In PDF document text
    • http://files.thedinopark.com/uploads/1/3/2/7/132740415/6535022.pdfIn PDF document text
    • http://miwuwi.floygregg.com/uploads/1/3/0/8/130813965/dofuxajajudara_dupatusojakog.pdfIn PDF document text
    • http://vakonow.doublejoutfittersny.com/uploads/1/3/1/6/131606271/2717341.pdfIn PDF document text
    • http://bavasu.totsandco.org/uploads/1/3/0/7/130776089/zuwir-gilatewil-sisas-fajid.pdfIn PDF document text
    • https://site-1043119.mozfiles.com/files/1043119/69452278419.pdfIn PDF document text
    • https://site-1036945.mozfiles.com/files/1036945/badokorafufawivewulopozef.pdfIn PDF document text
    • https://site-1036698.mozfiles.com/files/1036698/58833105332.pdfIn PDF document text
    • https://site-1039624.mozfiles.com/files/1039624/29751849206.pdfIn PDF document text
    • https://site-1040974.mozfiles.com/files/1040974/xuxutopukaxujekenulis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9380/3679/files/the_shape_dead_by_daylight_build.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4530/6011/files/27697430954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2080/4518/files/lg_inverter_direct_drive_washer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5024/6039/files/gimebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0368/5275/files/lou_christie_songs_and_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/2170/9724/files/58531470118.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5897/8207/files/macbook_pro_overheating_2015.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6404 5448 bytes
SHA-256: 4dc7ef7e1ed64e76cd27702daf18f908ddd452afe7bba3bcf866e0938dda9c44
font_01_sfnt_off000076a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76A8 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off0000820a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x820A 10116 bytes
SHA-256: c2b1c36ac2b512a5539455ec9bb3d6525110ceea1906ee6d195cdde2f0f7fc50
font_03_sfnt_off0000a4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4E9 9324 bytes
SHA-256: 3ed6ec601efe29a37e4a0ef26ec151079899a9ebc8db64f4e6cb108ac98abd35

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