Malicious PDF — malware analysis report

Static analysis result for SHA-256 61027dcaa5910f30…

MALICIOUS

PDF

41.8 KB Created: 2020-09-05 10:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1495226998eedc29bb6a6c1346fbb167 SHA-1: 6c0a7c5c9f0aeec9b8835819c42c31765f259ac3 SHA-256: 61027dcaa5910f302e8ec6ad33f33de518534aae521d5d1b0eec26e058e791c7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL, https://ttraff.club/wix?keyword=converting+mm+to+cm+worksheet+year+4, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to be an attempt to disguise the malicious intent by presenting as an educational worksheet. 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.club/wix?keyword=converting+mm+to+cm+worksheet+year+4
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/6f58fb_9c4b6b8ae52b42c19077095824c7e2fc.pdf
    • https://static.usrfiles.com/ugd/ce14f3_f85f91f603f44cffa72b5576c86fc9ee.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_3739b7be990d44c9a009b77c4308cde7.pdf
    • https://static.usrfiles.com/ugd/01bc73_01493fa094414b3a9c6fafd2a6e2362a.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5dd74ee3ad4427f93df57699b33fe1d.pdf
    • https://static.usrfiles.com/ugd/b58d21_cd63ddfa96db4207aca4fe4a65db9731.pdf
    • https://cdn.shopify.com/s/files/1/0432/0775/3888/files/capteur_capacitif.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/61233779421.pdf
    • https://cdn.shopify.com/s/files/1/0433/4341/3407/files/all_about_me_questions_high_school.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_717701d44687499aa17bb47d67ad011f.pdf
    • https://static.usrfiles.com/ugd/d5415a_9512e150536b465798d088bfdd7cba3a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000587f.bin
7f9739e6b9388538174d674ef3b60afe5d856672d9f9b6a77c46b70a6f49a9a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x587F 5400 bytes
font_01_sfnt_off00006ad3.bin
2081a2f4cde636db4709152ec5124c7fabf21272342c4d1972036602f84ebbcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD3 9864 bytes
font_02_sfnt_off00008ca4.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA4 4324 bytes