Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c69bc09eed6ac43…

MALICIOUS

PDF

42.6 KB Created: 2020-09-19 02:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4a7177e2c36328722259790459f1d379 SHA-1: bcd5eca41c15c86e4e952ebc9926365c976b0ee5 SHA-256: 8c69bc09eed6ac4301809492123bd73908f70b13cf089283c0b6a12c7bd9b08c
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains multiple embedded links pointing to known malicious redirector infrastructure and a link farm. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic, suggesting an attempt to drive traffic to malicious sites. The presence of numerous PDF links indicates a potential SEO poisoning or link farm strategy to distribute malware or phishing content.

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://ttraff.com/wix?keyword=big+brother+albania+9 In PDF document text
    • http://files.barrabahistory.com/uploads/1/3/1/4/131437531/6619511.pdfIn PDF document text
    • http://files.slsareascouts.org/uploads/1/3/0/9/130969830/287d92604.pdfIn PDF document text
    • http://files.scullycustomcarpentry.com/uploads/1/3/0/7/130739919/suris.pdfIn PDF document text
    • http://files.jessicalyonslmft.com/uploads/1/3/2/6/132695455/mejuvaperixeza_nopafukorigexur_xexojunupidolip_samiza.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/1/0440/0594/9590/files/free_to_word_converter_freeware.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9231/9139/files/adobe_reader_9._3_version_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/world_3_kancolle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0159/3505/files/.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/56396413993.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6349/1222/files/ramejipeperifusizofakopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2603/7411/files/academia_school_simulator_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6716/3302/files/tukagolodoruzotap.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_off000066d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D8 5112 bytes
SHA-256: 45128460106a48e95179c61ec23106463eb4923dde7f88d4e98f2ec514f943e2
font_01_sfnt_off0000783c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x783C 11484 bytes
SHA-256: 252ff1d2d1b2a3ac3c9cbbdb19b7dfcfa6bc3a52524c441bdb871ccce725aefc

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