Malicious PDF — malware analysis report

Static analysis result for SHA-256 670be4eb31ff7f5f…

MALICIOUS

PDF

46.1 KB Created: 2020-08-06 01:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47a90214efdbbbddebf9c4454deb1df3 SHA-1: 7930721d153ae4c9d7f22c61a9880995dcda6c39 SHA-256: 670be4eb31ff7f5f7caa411e7611330b6666cf65fe49fa9c104114b41fb56bda
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, masquerading as a resource for 'Java string interview questions'. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to a known malicious redirector. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=java+string+interview+questions+and+answers+pdf
    • http://files.perfectlayout.co.uk/uploads/1/3/1/6/131606069/mojovoferopudibo.pdf
    • http://files.traditionsandrecipes.com/uploads/1/3/1/0/131070317/lonavimuv_puwedunuv_nemotogozirar.pdf
    • http://files.graceteambuilding.com/uploads/1/3/1/8/131856949/tamotepamo_pupulu_torajimutababon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/libajefapawe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6405/6225/files/7777857353.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3580/files/xelalurefunimobom.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3841/files/aurat_maghrib_aur_islam_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zupapinited.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/japoxotoruzub.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/xuzazolanutikivexax.pdf
    • https://cdn.shopify.com/s/files/1/0436/0211/6772/files/56965374771.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7381/files/lupuxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9934/8373/files/cannot_download_album_from_photobucket.pdf
    • https://cdn.shopify.com/s/files/1/0450/6569/9478/files/ffmpeg_combine_audio_and_video.pdf
    • https://cdn.shopify.com/s/files/1/0433/6713/7438/files/bokifutejugetux.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3784/files/ritome.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007577.bin
f0e320acfe50d530505ccb94777e0c857d990af6324a72455ebe2049ac101fc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7577 5444 bytes
font_01_sfnt_off0000881a.bin
465a0593281e2a6664132be32f88a5771e67fa190674468d45ea524c1207a62d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x881A 10120 bytes

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