Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87cb20fc37f6b5f…

MALICIOUS

PDF

49.7 KB Created: 2020-08-14 00:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b72838c3d57e6ff5f68023c1653df635 SHA-1: 4c7e7b19c1730c2bf626d75e7a4d98e1eb24273a SHA-256: d87cb20fc37f6b5f541ffd172a482be656a1e14da44ab5e885383f2806226d10
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic identified a link to a known malicious redirector infrastructure at `ttraff.ru`. The document body, though heavily corrupted, contains text referencing 'Autodesk inventor professional 2017 manual pdf' and the malicious URL, suggesting a lure to a malicious site disguised as a software manual download. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=autodesk+inventor+professional+2017+manual+pdf
    • http://gozil.education-pathways.com/uploads/1/3/1/3/131380429/5471891.pdf
    • http://nusizenar.inclusivecatholics.org/uploads/1/3/1/4/131438013/pozifujopetiwomedep.pdf
    • http://jumomufom.ekneinfo.com/uploads/1/3/2/6/132695903/60ea8122184.pdf
    • http://xawikeg.projectahimsa.org.au/uploads/1/3/0/8/130814238/dedoxigugogobak-romudedinevo-xiwakanufedivu.pdf
    • http://files.thebasslaboratory.com/uploads/1/3/1/6/131636655/dasozetute.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9670/files/iv_admixtures.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/milestones_of_development.pdf
    • https://cdn.shopify.com/s/files/1/0448/2560/8353/files/amrita_nayak_all_song.pdf
    • https://cdn.shopify.com/s/files/1/0440/9825/7048/files/fezawasiligisoxujezurix.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/the_pardoner_s_tale_translated.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/beponuzakemebafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/33428846419.pdf
    • https://cdn.shopify.com/s/files/1/0430/7343/7847/files/bmw_branding_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4344/files/xuvizuwovuxedovav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61403973964.pdf
    • https://cdn.shopify.com/s/files/1/0437/1555/9573/files/vazisimulilokipon.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/87566686049.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_off00008245.bin
1ffbabee6ef4887fd2e495a5dbd36d35c498b8eef24a4fb0d56522bd0eb7a701
pdf-font-stream PDF embedded font (sfnt) at offset 0x8245 5708 bytes
font_01_sfnt_off000095a2.bin
8d6fee3224d62cdcd5277b84f53bc0bd036edc463226112be654987022b8821c
pdf-font-stream PDF embedded font (sfnt) at offset 0x95A2 10432 bytes