Malicious PDF — malware analysis report

Static analysis result for SHA-256 490c58988d47da83…

MALICIOUS

PDF

39.9 KB Created: 2020-08-09 19:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0c8bb941f58740b436c2296288b7d02 SHA-1: 1dcec42c327d5c56f8a0e9f7fecd1674c643af53 SHA-256: 490c58988d47da83baa4dc0d01ecdd3aec0b6d83e26d0e1bc7cb4356a75912e5
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with the primary link leading to a known malicious redirector. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure related to 'cell biology journal articles'. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be tricking the user into clicking a link that leads to malicious infrastructure.

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.com/pify?keyword=cell+biology+journal+articles+pdf
    • http://files.mallimopianostudio.com/uploads/1/3/1/4/131408572/tokijinowazu.pdf
    • http://files.pholanasianbistro.com/uploads/1/3/2/6/132682684/2351157.pdf
    • http://detomexa.frigatebirdfishing.com/uploads/1/3/1/6/131606349/5093209.pdf
    • http://mebakin.vanengelsdorpbeelab.com/uploads/1/3/2/6/132682090/5b041bdb45.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/73277356076.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/lewavezimefipatedu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0435/0181/3915/files/sufiwegulexogub.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/40710431877.pdf
    • https://cdn.shopify.com/s/files/1/0446/6740/4451/files/tinuwijepujamosivibizetu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/15604352736.pdf
    • https://cdn.shopify.com/s/files/1/0440/5359/4277/files/nirofizuduji.pdf
    • https://cdn.shopify.com/s/files/1/0433/2693/1099/files/automann_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59044096386.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2269/files/25570893955.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9735/files/jidizulelusidik.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_off00005e89.bin
78ca28b0d8469586184fcd09f9caba476a75b2e3983a255cfdeefddae97e4097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E89 5544 bytes
font_01_sfnt_off00007176.bin
4ceb71aeb9cb88bda8a9c964e32fad4c8c41a994ea519317887e0bb59aab6edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7176 9784 bytes

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