Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c209e3efa2feba2…

MALICIOUS

PDF

53.3 KB Created: 2020-08-10 21:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e72b1d751fe9c742b1038bec2a96eefb SHA-1: 44d649f165e03437e0f3808f993f968dbb93a4e4 SHA-256: 8c209e3efa2feba29b1f3287328d87f9af10911a1449f07355637e8e7a2fddca
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one identified as a malicious redirector. This suggests the document is designed to lure users to malicious websites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is a high-confidence indicator 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.cc/pify?keyword=mastering+the+international+phonetic+alphabet+pdf
    • http://nifukuw.bathhousebasics.com/uploads/1/3/1/8/131856158/6050874.pdf
    • http://luwen.tomscot.org/uploads/1/3/2/6/132681394/8107370.pdf
    • http://files.edzizatrails.com/uploads/1/3/0/7/130776363/5292806.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9446/files/pathfinder_advanced_race_guide_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5624/2581/files/85677124477.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/how_to_convert_mkv_to_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0435/6921/7699/files/alternative_dispute_resolution_act_1996.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23063093424.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4447/files/76091177430.pdf
    • https://cdn.shopify.com/s/files/1/0439/5171/8558/files/39270557160.pdf
    • https://cdn.shopify.com/s/files/1/0440/6276/9302/files/rusux.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/mubab.pdf
    • https://cdn.shopify.com/s/files/1/0433/6458/1525/files/70361748807.pdf
    • https://cdn.shopify.com/s/files/1/0432/0516/5216/files/rupemozasonedoner.pdf
    • https://cdn.shopify.com/s/files/1/0430/7153/7301/files/33238460965.pdf
    • https://cdn.shopify.com/s/files/1/0440/7692/5078/files/lesco_48_belt_drive_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/72838026008.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/39869955814.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dcf.bin
848d3c137df020cee9c88b1a5b9236ef80c16bb2b4b8274398fc6aca3ef64bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCF 5560 bytes
font_01_sfnt_off000080ad.bin
3b9103641572345e829719d65d9614b1e7dca7410f2dc2e1c6ebfc8addc50b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80AD 13720 bytes
font_02_sfnt_off0000ae0b.bin
4c75516de7fd94817630f1b761b397627307ded82c92707b7c583ed622fece73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0B 16836 bytes

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