Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c0e7859ff2bb8c…

MALICIOUS

PDF

42.1 KB Created: 2020-08-20 11:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be6ee62d476fab6c198f532c87d2a2fc SHA-1: ab1f85e1fc430bf403180a8c25ddc745f992f14d SHA-256: 83c0e7859ff2bb8c970a224e08b052b842ceb902792777ce08a599381fbf9170
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a weather report that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF also hosts a large number of external links, suggesting a link farm for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious intent to redirect users to harmful sites.

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/pify?keyword=heckmondwike+weather+report
    • http://files.christopherglenncannon.com/uploads/1/3/0/7/130776208/3496893.pdf
    • http://files.ondaruokala.fi/uploads/1/3/1/3/131381675/guxenu-fevuwizuvoledut-fanamurusotep-kegatupufal.pdf
    • http://sifop.lllofaz.org/uploads/1/3/1/3/131384516/kimivunojizof.pdf
    • http://files.parsonswoodartistry.com/uploads/1/3/1/4/131438175/248fe55.pdf
    • http://files.climatechheatingcooling.com/uploads/1/3/1/6/131636947/7365342.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/39574853849.pdf
    • https://cdn.shopify.com/s/files/1/0431/3209/2573/files/dmv_dl_44_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/water_pollution_definition.pdf
    • https://cdn.shopify.com/s/files/1/0434/8366/0441/files/84568924493.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/dijasejusevif.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/prueba_carbono_14.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/debabipupu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9397/3405/files/mulonowifusap.pdf
    • https://cdn.shopify.com/s/files/1/0437/6484/2657/files/sejepat.pdf
    • https://cdn.shopify.com/s/files/1/0437/7654/0834/files/76168729429.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/waxigulazatep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6558/files/ap_calculus_textbook_finney.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005233.bin
10b8e16289312e698d4eade39f0f9115642a0cf3d83d2d45dd200fda3a19cf65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5233 5008 bytes
font_01_sfnt_off0000630a.bin
9df01a20d1861001cb76e5cf2e463954fa5a15bd09f8c8ab1d875d84ced10854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x630A 13272 bytes
font_02_sfnt_off00008d8a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8A 4324 bytes

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