Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed3575d6d0c30d1…

MALICIOUS

PDF

40.4 KB Created: 2020-08-19 20:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dfc28fe19151e04636edba79b29a675 SHA-1: e3ac25bb5df5209bbd56acd7a4fc09dc20405f48 SHA-256: 5ed3575d6d0c30d1d2cb4205b1c4f59952ca357a5759175018abfa4ad3ca1f43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body text, though heavily obfuscated, contains the URL "https://ttraff.com/pify?keyword=mastering+diabetes+pdf", suggesting a lure to a malicious site disguised as a PDF download. The presence of a link farm further indicates an attempt to distribute malicious content.

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=mastering+diabetes+pdf
    • http://ruvadixu.ellinwoodgolf.com/uploads/1/3/1/0/131069934/7272320.pdf
    • http://files.mauikamaolecondorental.com/uploads/1/3/0/9/130969053/9080756022d.pdf
    • http://files.krystalfood4thought.com/uploads/1/3/1/4/131438397/ea4ec10e6d.pdf
    • http://rimosu.npcdb.com/uploads/1/3/1/4/131438268/1323671.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/66805508948.pdf
    • https://cdn.shopify.com/s/files/1/0438/0668/7394/files/vijusumenizuzaretubixi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8116/3157/files/jigatixolifonavokip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/modern_calligraphy_fonts.pdf
    • https://cdn.shopify.com/s/files/1/0440/1663/1973/files/define_annotation.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/46522284771.pdf
    • https://cdn.shopify.com/s/files/1/0432/3567/2219/files/5669467702.pdf
    • https://cdn.shopify.com/s/files/1/0440/6696/3621/files/puvil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/golizikedakumeru.pdf
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/narinug.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/21332360344.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_off0000617a.bin
646c978a2d01740dc6d9bc640e4306b72f16aee0d1836d7c4d3045164acbba10
pdf-font-stream PDF embedded font (sfnt) at offset 0x617A 5324 bytes
font_01_sfnt_off00007397.bin
8d5b4f1f59fdec997577d89be17e096249d5c9abb1cb91c722254c1ba5056722
pdf-font-stream PDF embedded font (sfnt) at offset 0x7397 9772 bytes