Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f82871796acc61…

MALICIOUS

PDF

45.5 KB Created: 2020-10-20 13:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b059bf96c895cfd3865a6f7d0238b78b SHA-1: 7a88489b91e565491c0d4753c083d17ee6321393 SHA-256: 11f82871796acc61ba60524ff50360ea0cda7cd5efa34806b33031deb1b0379d
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, including one pointing to a known malicious redirector. The document's content, though heavily obfuscated, appears to be a lure related to 'Kalendarz google na androida' (Google Calendar for Android). The presence of a malicious redirector URL and the sheer volume of outbound links suggest an attempt to drive traffic to malicious infrastructure, likely for phishing or malware distribution.

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/123?keyword=kalendarz+google+na+androida In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f8753113811e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5f8b800986bcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f87147f16513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5f8ca0676c45e.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/1318904.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/bugojozozu.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/2106393.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/9c0541618c593b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5f88ef39ea8a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f8cea4825542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f8de194d6892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5f8e37bfe7e19.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/1/0496/6360/6933/files/chapter_4_congruent_triangles_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0314/9479/files/64967618465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7808/3255/files/shooting_an_elephant_analysis_prezi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8713/3860/files/waxebafoladudezuvogiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf241574-1757-4bed-bf12-4ecb501eecab/78498630711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d9bd76-31b9-4461-9c17-25ce68cef0c0/85069949913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b3a9b7-e381-446c-b1f2-7e42d7e6bb67/zarupatugetufolatut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9449/5398/files/vifelevemomolopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6310/7480/files/36100181868.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8650/1806/files/kudivekokusok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/25384057150.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8560/4017/files/jufaka.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7266 4836 bytes
SHA-256: 9e780f2dcb04170d1d91e4a0191f033dce6b4d61eb1b2acbcfb17827b56dadcb
font_01_sfnt_off000082ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82EE 11268 bytes
SHA-256: b2653e54177a0b1547e53a75327ff0d34ac9fa59388e598aa8da9d03c00eaf23

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