Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b9c60ef994f972…

MALICIOUS

PDF

63.0 KB Created: 2020-10-17 07:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5a0d2c4d09026ff5d536f67b726494e8 SHA-1: 6e084548a3e45931f3160f8f529c0377138a3445 SHA-256: 61b9c60ef994f9727425bcbfd72dbe21aa38e69e6da6eccf79b63b1f6d23c64e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ggraff.ru, which is a strong indicator of malicious intent. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/strik?keyword=persona+5+sae+niijima In PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/zuratexizi.pdfIn PDF document text
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/povurixu-nenilizu-lixegat-kufuxuwuri.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/resojafon-zekuni-sudeviganima.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/gerutogevovag_lutuli_pajipidobib_fuwozapep.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/b9ae3.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/9684596.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/pokobu-pidoror-pekirez.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bigunurusipota_vovavubavuw_malolipesafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7035/7149/files/scotts_lawn_mower_parts_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8907/0747/files/48811346673.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0284/2269/files/79402041604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2475/6121/files/rakuruzomelulubi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5464/0535/files/54217232591.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6724/4183/files/12000196407.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2890/5625/files/desert_meaning_in_hindi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9002/8960/files/estandares_y_expectativas_de_espaol_decimo_grado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/lodixewejabogozu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7990/2383/files/excel_document_not_saved_network_share.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1931/3569/files/the_answer_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/telecharger_application_youtube_android_gratuit.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA44C 5000 bytes
SHA-256: 370ca86a659c4cc21cb4869a5093ab3ff4781912bbb826fa568b2f25d10cecdb
font_01_sfnt_off0000b539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB539 10680 bytes
SHA-256: 234b1a5ae4b3310c8a037061c5fcbd77adc758c73b89946405219828b8c42479
font_02_sfnt_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 16128 bytes
SHA-256: 9876d0897ec9c8daf800546b62de215c972fdd6e45e85ac3a8ec620a70dbc6f8

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