Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e5eb7bf430d6fa…

MALICIOUS

PDF

44.6 KB Created: 2020-08-22 18:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3de1c81f714234d3282fa7c5bea941f1 SHA-1: 3e5f2c20c2087a444d12b0c1740f638a82ff21d4 SHA-256: 61e5eb7bf430d6fae7eee28872105dc9cf0cfa384064bfea7efc9af66b4c4a3c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL 'https://ttraff.ru/pify?keyword=apache+tomcat+9.+0.+6' as malicious. The ML classifier also strongly indicated maliciousness. The document body appears to be garbled, but the presence of numerous links suggests a link farm or phishing attempt.

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=apache+tomcat+9.+0.+6
    • http://files.shopblushsalonboutique.com/uploads/1/3/0/7/130776088/dugatoselimib-zosigujo-zusuxi.pdf
    • http://xugofexo.thevasculargroup.co.nz/uploads/1/3/1/6/131637016/2526372.pdf
    • http://files.unioncongregationalucc.org/uploads/1/3/0/7/130775229/7890077.pdf
    • http://kojexem.chasingbears.com.au/uploads/1/3/2/7/132740480/sidezixok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1827/2423/files/brambleton_deli_menu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7548/5348/files/meiosis_coloring_worksheet_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/9015/7474/files/the_addiction_treatment_planner_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/1641/9488/files/multiplication_worksheets_ks2.pdf
    • https://cdn.shopify.com/s/files/1/0435/1016/9759/files/sobes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/the_botany_of_desire.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7175/files/calendario_serie_a_tim_2020_18.pdf
    • https://cdn.shopify.com/s/files/1/0439/6944/6046/files/xupozadetixefax.pdf
    • https://cdn.shopify.com/s/files/1/0434/5842/9078/files/style_telugu_movie.pdf
    • https://cdn.shopify.com/s/files/1/0435/0859/6900/files/oath_of_ancients_paladin_5e.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0099/files/48452879429.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_off00007098.bin
43cfa0fe2c25964fdffa4084771e1b44df14420acd55a36fbc1d7b582e533fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7098 5340 bytes
font_01_sfnt_off000082a8.bin
1615cb402981177650c7bfa8244a2ff99be2decbc20be57a941c178b26542e92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A8 10336 bytes

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