Malicious PDF — malware analysis report

Static analysis result for SHA-256 518fa57ec4f60fff…

MALICIOUS

PDF

42.3 KB Created: 2020-08-19 06:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25d713d4e3d931e325747eaaf7b5fe75 SHA-1: 751789e7f8eaecd67138d56382adcde7acfc0956 SHA-256: 518fa57ec4f60fffb15022ee7d7b9368ba05bb2b735fd8c1660a206d25307323
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links redirects to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to 'free timeline template pptx', suggesting a lure to entice users to click the malicious links. The ML classifier also strongly indicated maliciousness.

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=free+timeline+template+pptx
    • http://nelemido.collegedreamsconsulting.com/uploads/1/3/0/8/130873995/rigatavijimepef.pdf
    • http://files.melissasterry.net/uploads/1/3/2/6/132695701/6596421.pdf
    • http://files.californialightingconcepts.com/uploads/1/3/0/7/130740568/lawemugevix.pdf
    • http://debogir.isawyournutsmommy.com/uploads/1/3/0/8/130874493/tomozolovaginulixiwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/finding_limits_using_graphs_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8997/files/27898096693.pdf
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/93452771819.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3203/files/balifunul.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/togorogolegaxuwap.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9588/files/graco_magnum_x5_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/9471/9131/files/guwegisi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91300886864.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2690/files/distributive_property_problems_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/coordinate_geometry_formulas_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pisanebemewamabojesodid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdf
    • https://cdn.shopify.com/s/files/1/0437/6782/4533/files/47369311242.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/mimog.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_off000069ba.bin
0e5949e4ed952dc8304e451342a399e50859c1e0745e65c974f9f120bc9970b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BA 4812 bytes
font_01_sfnt_off000079fb.bin
81570e72512e7725a2bc3d6ffd05cfb49915db265e14d98b6342527610fc842f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FB 9980 bytes

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