Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86da58c63840dd9…

MALICIOUS

PDF

43.6 KB Created: 2020-09-11 05:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3bab234cb595d9be800e10cb148d358 SHA-1: 13982c0c1b22c24649ed4486b63253eceb67d80c SHA-256: f86da58c63840dd92df874e16a8bc0a0f3045fd1bb115a53a2fedaf616fa34cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, pointing to a URL that appears to be part of a link farm. The document body, though heavily obfuscated, contains the same URL. This suggests the primary intent is to redirect the user to a malicious site, likely for phishing or malware distribution.

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.club/wix?keyword=articles+determiners+and+quantifiers+worksheets
    • https://static.usrfiles.com/ugd/99a8f2_87cb151c16fc4eecb3876a2fcab6824c.pdf
    • https://static.usrfiles.com/ugd/b8c837_548c94c05dee4178b9bbfeab9398e19c.pdf
    • https://static.usrfiles.com/ugd/98e298_9afbfba69a5e472e9692448246c22340.pdf
    • https://static.usrfiles.com/ugd/2d797c_1b46ce0af8b642e3b6f0a518b35838ae.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/suwesepopefalatizawu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/najawisa.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/20859168134.pdf
    • https://cdn.shopify.com/s/files/1/0437/0527/0427/files/bilezowesobu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/corrugated_roofing_sheets_ireland.pdf
    • https://cdn.shopify.com/s/files/1/0437/4108/5845/files/jamifibulobo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8187/5104/files/acknowledgement_of_paternity_texas.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/pixuworuma.pdf
    • https://cdn.shopify.com/s/files/1/0439/1347/8312/files/seravumemon.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/karuppasamy_song_ringtone.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c3f.bin
0955b7e2f4759f7d8f72a1ddfce36c5c2b6927a677062ee967591f52e943a125
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3F 5532 bytes
font_01_sfnt_off00007ef1.bin
e52445b9b9d431041e102c5b9b746d1c1f0f5887e015ade3c05a723dba5fe698
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF1 10060 bytes