Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e93dc7616a2db8…

MALICIOUS

PDF

44.5 KB Created: 2020-08-21 02:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a53ab9cad19c5c4f976c7a98d846010e SHA-1: b2af36b8e7611408daf8987600a84672e0bd135a SHA-256: 05e93dc7616a2db824c2576b33d7fae1a1f9352046283b35a099c25d68ab5943
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially garbled, contains text related to 'rent agreement on stamp paper pdf' and the malicious URL, suggesting a lure for phishing or malware. 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.ru/pify?keyword=rent+agreement+on+stamp+paper+pdf
    • http://soranerik.hartmanholistichealth.com/uploads/1/3/1/3/131380183/wenarimubeb.pdf
    • http://files.catrinatenganartistry.com/uploads/1/3/0/8/130814208/mipuze_jatujuxol.pdf
    • http://files.freedomdayusa.com/uploads/1/3/0/7/130739590/8492659.pdf
    • http://vakolil.occasionssingers.org/uploads/1/3/0/7/130775164/bafetivowujukijoge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4130/8320/files/2297120908.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/type_1_diabetes_mellitus.pdf
    • https://cdn.shopify.com/s/files/1/0439/3969/2699/files/gumobujubapik.pdf
    • https://cdn.shopify.com/s/files/1/0432/1250/5243/files/sonic_chronicles_the_dark_brotherhood_rom.pdf
    • https://cdn.shopify.com/s/files/1/0438/0930/8829/files/regogunagibivonimep.pdf
    • https://cdn.shopify.com/s/files/1/0445/9141/5460/files/anointing_of_holy_spirit.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/nazivobuso.pdf
    • https://cdn.shopify.com/s/files/1/0433/6369/6805/files/nebizajofuk.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_off00007077.bin
e7a40ccaca3ecd2bbc8c79887d621a3b69a68187f056f02f39fb78bf22e2cc0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7077 5336 bytes
font_01_sfnt_off00008290.bin
452db3c9e7588c6d876788c97d2e2113d0137b1338f4189c1266bf9589be5b8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8290 10212 bytes