Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f98387e08b8767e…

MALICIOUS

PDF

38.8 KB Created: 2020-10-29 12:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 10e483e7a732ad03b36b48ebb7725c77 SHA-1: 76ec38c987604e8d46e7a7bd474d8fb211dec3e2 SHA-256: 4f98387e08b8767ee482ba5176da834a69e7b8798fe7d5c06f94b6d3730f072f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to redirector infrastructure and link farms, indicating a malicious intent to direct users to potentially harmful websites. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, reinforcing the attack pattern of using deceptive links. The ML classifier 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=basic+principles+of+the+us+constitution+worksheet+answers In PDF document text
    • https://delutezebojuk.weebly.com/uploads/1/3/4/3/134353455/6197271.pdfIn PDF document text
    • https://jatokogeredere.weebly.com/uploads/1/3/3/9/133997843/duzumuwuje.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/tipix.pdfIn PDF document text
    • https://wegogutez.weebly.com/uploads/1/3/4/3/134310606/dolinivonajukidab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_5f98abaedbbee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_5f97a8f6c893c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_5f95821f33893.pdfIn PDF document text
    • https://bopifodefow.weebly.com/uploads/1/3/4/3/134383970/7854451.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/dodosonuw-loperuw-tofise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5f933a5cc2776.pdfIn PDF document text
    • https://guxewegitonis.weebly.com/uploads/1/3/4/3/134336720/6d181936337e92.pdfIn PDF document text
    • https://vesalitekaso.weebly.com/uploads/1/3/4/3/134314643/viwowazigura_sabek_nipowuzivawu_wojujuwuba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0505/3218/8357/files/lg_rumor_touch_sim_card.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/misavoginofoda.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/dimijemetetiduwekode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1496/9246/files/3200452573.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/9001/5904/files/cva_hunterbolt_magnum_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8034/4246/files/23532455147.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/94861775623.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7506/2945/files/xesatalodete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6123/2294/files/resound_hearing_aid_app_for_android_phone.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C44 5188 bytes
SHA-256: 42b1543bfd4047e275ce7a1e071c0e830afe13fdfc48844219ffda5dd99c64e8
font_01_sfnt_off00005de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE9 9972 bytes
SHA-256: f7a1bd0648e095514115a3499b250375a600de427a4b94a9b4164179c7bcd16e
font_02_sfnt_off00007e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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