Malicious PDF — malware analysis report

Static analysis result for SHA-256 691ead2625dde2fa…

MALICIOUS

PDF

43.2 KB Created: 2020-07-31 03:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0153acd3205dedecdd6b3afaf22b1db2 SHA-1: 50578a645e043c2493ef241b8567a5948dd31207 SHA-256: 691ead2625dde2fa658f5e1c7bf25366d8dab851769c810801613b1d31792d95
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to PDF editing, likely to drive traffic to malicious 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/wb?keyword=pdf%20editor%20online%20no%20watermark
    • http://files.dharmayogawheel.com/uploads/1/3/0/7/130775197/pekalebosov-doburutuwidunoj.pdf
    • http://files.mnconference.org/uploads/1/3/0/7/130738892/vogejuxov-zuwuxiz.pdf
    • http://files.alexandraportersoprano.com/uploads/1/3/0/7/130776812/wixajutunuxajediwava.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/vixudonabog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sabam.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/29985109531.pdf
    • https://cdn.shopify.com/s/files/1/0432/5225/2829/files/40382075737.pdf
    • https://cdn.shopify.com/s/files/1/0429/0812/3303/files/povevegilatoruke.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/bavuxokuvozukopisug.pdf
    • https://cdn.shopify.com/s/files/1/0429/6232/1571/files/mupejebex.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9529/files/973345145.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/96452425375.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/19276905720.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8206/files/wuvotujoxamadakex.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_off00006da7.bin
98a7513b987da62cdd9dcebdabcfc1227cab2771884517adfd5daab2c4066125
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA7 4820 bytes
font_01_sfnt_off00007df4.bin
120e2f912fdd471d5abfd2e11fad925bb556875a994faeddc15bd017d318375d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF4 9944 bytes