Malicious PDF — malware analysis report

Static analysis result for SHA-256 7738150e83854361…

MALICIOUS

PDF

35.1 KB Created: 2020-08-08 10:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 689191075d9c0d5ee43023799c672cfa SHA-1: b6e495bf6de1ec8495e271bc8c4365bd47acf267 SHA-256: 7738150e83854361bd2c1e91a7a7965560f227567459b3cff75a4136d2e14a2e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. While many links point to benign Shopify URLs, the presence of the malicious redirector indicates an attempt to lead the user to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=r%25C3%25A9sum%25C3%25A9+de+cours+d+atomistique+s1+pdf
    • http://files.writing-raven.com/uploads/1/3/1/4/131438038/pujakata_gagifere.pdf
    • http://files.artdroparvada.com/uploads/1/3/2/6/132681611/6848928.pdf
    • http://files.westcarypsychiatry.com/uploads/1/3/2/7/132712096/7721647.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/2584/5659/files/wella_color_charm_chart.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8582/files/13846749966.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0494/files/tifaragamozadibevurejofoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1615/0427/files/84209583709.pdf
    • https://cdn.shopify.com/s/files/1/0447/7085/3013/files/autocad_visual_lisp_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/5727/5299/files/32943100392.pdf
    • https://cdn.shopify.com/s/files/1/0432/8787/1646/files/mafotojumexebe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/vevegixibiwolij.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/23486919073.pdf
    • https://cdn.shopify.com/s/files/1/0431/6912/0413/files/centurylink_modem_login.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3318/files/grammar_test_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0434/3444/2908/files/crash_course_gastrointestinal_system.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_off000049a2.bin
c1f510701d5cf4918bd567b810449bb897b307f99cdffd4c220b49c313b71cd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x49A2 5596 bytes
font_01_sfnt_off00005c57.bin
8f89b41511a547f1a1e7b918be6ecf40b81a0d9c4c074674d70e937f48fc7bb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C57 10060 bytes