Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7fca6a4eb0b4ac…

MALICIOUS

PDF

37.0 KB Created: 2020-09-05 07:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc535acb7c84236c499e50b89c33ad59 SHA-1: 27ffdd97fd0971548911b7d5c8e8f6a12e786117 SHA-256: ca7fca6a4eb0b4acae293fec3633f62d6ce5a8aee8ac9614be7e67baa1b73c4b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.club'. The document body, though heavily obfuscated, contains the same malicious URL and appears to be disguised as an educational worksheet to lure victims. The ML classifier strongly supports the malicious verdict.

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=helping+verbs+worksheet+1st+grade
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/13969448790.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/a_tube_catcher.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/58110920092.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.pdf
    • https://cdn.shopify.com/s/files/1/0447/4057/5386/files/writing_algebraic_expressions_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0819/6767/files/59363142195.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1752/files/75447655051.pdf
    • https://cdn.shopify.com/s/files/1/0436/9602/9864/files/panolinosogi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/github_ssh_config.pdf
    • https://cdn.shopify.com/s/files/1/0440/9619/2664/files/bryan_hawn_the_list.pdf
    • https://cdn.shopify.com/s/files/1/0435/2416/1704/files/the_chaser_movie_english.pdf
    • https://static.usrfiles.com/ugd/1a89c8_1f6067261929407fb547be07c60b184f.pdf
    • https://static.usrfiles.com/ugd/24deb6_6522f8127bec4bd78f3a7c520180f385.pdf
    • https://static.usrfiles.com/ugd/cc14e4_63ade78d83e640c0a248ad9ce440ff2c.pdf
    • https://static.usrfiles.com/ugd/7041e4_27b5e4cd114246eaa1656012319733d0.pdf
    • https://static.usrfiles.com/ugd/17159d_0eb8530177f0498eae0fca6b938191de.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_off00005120.bin
66a75789a163c691f6a0068377e11a110ab72e7ec7c9fe0459810a84163ee519
pdf-font-stream PDF embedded font (sfnt) at offset 0x5120 5588 bytes
font_01_sfnt_off0000642c.bin
2145377e8e52f50126cb8062aa070059de1603b3ac07388554f5bbcfd4c3ee0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x642C 10240 bytes