Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2ca71677d9b1ae…

MALICIOUS

PDF

37.8 KB Created: 2020-08-29 04:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0f738d19301b934881bb1f6679259eb SHA-1: 7bdf4b737bbe6d9cde560685b7119a0266c17ee6 SHA-256: ef2ca71677d9b1aebb25ebae0ee704f1339789b6c2f736139d2af5544f71f31e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on 'static.usrfiles.com'. The document body, though partially corrupted, contains text suggesting it is a 'coordinate plane worksheet grade 6', a common lure to disguise malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=coordinate+plane+worksheet+grade+6
    • https://static.usrfiles.com/ugd/b8c837_de39db9160a14e5b852ed7e15ec69196.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a8b07f1bdc742179441e9bc251b0cc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_78aa68b51aef4b1ebe211b7ed2068c1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_096c9ef2c21d4edd99528077ba3309ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_7179e4a896db4a4b8894c3dffc7416ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_685995df0c9f4528acb37e7dac8408d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc707d8188394feda3da4bf5721843b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_b92fa0b6174c46968c8cddc0ad240f12.pdf
    • https://static.usrfiles.com/ugd/b8c837_892a9f32df13495b9abec32675d6c7e3.pdf
    • https://cdn.shopify.com/s/files/1/0436/9966/7099/files/10021853993.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/78961096288.pdf
    • https://cdn.shopify.com/s/files/1/0445/8224/0420/files/fire_emblem_awakening_marriage_chart_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/8660/9573/files/68533876864.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bb2cf143de4431291f4a0972526255d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b134deba61ea41e5b8d411481a5f561c.pdf
    • https://static.usrfiles.com/ugd/b8c837_815dbac699ec4db3914610e97b1382aa.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_off000052d9.bin
bc970def47e986f50bd801e989e947b93008e2e0319738dabeb03bfa1fa31902
pdf-font-stream PDF embedded font (sfnt) at offset 0x52D9 5436 bytes
font_01_sfnt_off00006564.bin
44cc880fcb59bf7a84282b9e2a7dad7da3f31695302c1b8036df08cd196ace78
pdf-font-stream PDF embedded font (sfnt) at offset 0x6564 10444 bytes