Malicious PDF — malware analysis report

Static analysis result for SHA-256 845c72519a87260f…

MALICIOUS

PDF

42.7 KB Created: 2020-07-26 16:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7f132518000d4d3d6ff5350059761f0 SHA-1: 636633bc251a33d17d6dfef3ddb6c19e9552a410 SHA-256: 845c72519a87260f159d280e2a174cc2798d8ffe23415655bad95b38610481a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to mimic academic content to disguise the malicious intent. The presence of a link farm and a critical heuristic firing for malicious redirector links strongly suggests an attempt to lead users to harmful sites.

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=oxford+handbook+of+clinical+hematology+pdf
    • http://files.sarahtorti.com/uploads/1/3/0/9/130969368/newabazu.pdf
    • http://files.covenantbiblecamp.org/uploads/1/3/0/8/130874352/4355132.pdf
    • http://files.diasalinas.org/uploads/1/3/0/7/130774979/5e8b10c9322.pdf
    • http://files.naturesconfluence.com/uploads/1/3/0/9/130969820/winirikitiwik.pdf
    • http://files.italybooktours.com/uploads/1/3/0/9/130969704/5360918.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6454/1852/files/runuzamufef.pdf
    • https://cdn.shopify.com/s/files/1/0432/6018/2692/files/vokagusesofovovevadegezof.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8727/files/weganewe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jomanumono.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/70851846884.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/sevisujugow.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/guwunag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/29719304838.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62654677968.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/poxesomolenosexazamov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.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_off000067f2.bin
be8225fb750c9e879ac49b8d2f4dbd882dc7b320acf5d4755fa11259bbbb2926
pdf-font-stream PDF embedded font (sfnt) at offset 0x67F2 5580 bytes
font_01_sfnt_off00007ac9.bin
504dcc2e7cef22489202a7e3b8334bd2436d55d68ec01fc95d58d4230d7ac89f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC9 10116 bytes