Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddc17e4b634b9d5…

MALICIOUS

PDF

36.3 KB Created: 2020-08-24 01:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 143a565397d4d5b3be8b818cf0f889de SHA-1: 5366375ec16b8d4b7662fe389f7f60bd519c958c SHA-256: 8ddc17e4b634b9d5993c5386a3e6ec7c582d8cc7ca77f9ea035e071f0a7f5122
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'Bottesford primary school ofsted report' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, further supporting the malicious intent of directing users to external 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.cc/pify?keyword=bottesford+primary+school+ofsted+report
    • http://bafewupa.schultzvalleyfarms.com/uploads/1/3/2/7/132712207/savuson.pdf
    • http://fewadokax.squidtasticart.com/uploads/1/3/1/4/131454859/lujerugumafugizubata.pdf
    • https://cdn.shopify.com/s/files/1/0435/4467/4455/files/voice_recorder_for_laptop.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/deteccion_de_placa_dentobacteriana.pdf
    • https://cdn.shopify.com/s/files/1/0439/2858/4347/files/kadowumesujamasonojuli.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/45522841025.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/82830493890.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3553/files/tratado_de_direito_penal_cezar_roberto_bitencourt_parte_especial.pdf
    • https://cdn.shopify.com/s/files/1/0437/7729/4498/files/78950839475.pdf
    • https://cdn.shopify.com/s/files/1/0461/7489/6291/files/ahirani_song_2.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/lazamavimegolunaweferemof.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7430/files/cartoon_movies_link.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/vetegirokepikozira.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/96282563800.pdf
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/abdominal_aorta_ultrasound_template.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e7b.bin
79663ac96fa7c253a6279f8c47a1fe9d7213a581f91323dc3dd588705b1f1e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E7B 5544 bytes
font_01_sfnt_off0000613a.bin
d25998c0268aaaf8bbe6bbe9c47dfa54eebb97ce885b6df48c0ca256e998e85f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613A 10312 bytes

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