Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf7f5a1f64b8816…

MALICIOUS

PDF

49.7 KB Created: 2020-08-31 20:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f61e3b3949aa1ac51e14c2930676fdc9 SHA-1: ff23c80ba6d6c047e817fc65eae13f87b839c615 SHA-256: ccf7f5a1f64b8816237388e9ea0419302099047d925968206c514fefa482ca9a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a lure for a "big basket app offer" and embeds numerous external links, including a critical redirector link to ttraff.cc. This suggests a phishing or scam attempt designed to redirect users to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of specific execution behaviors.

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/wix?keyword=big+basket+app++offer
    • https://cdn.shopify.com/s/files/1/0438/1235/6253/files/1342427998.pdf
    • https://cdn.shopify.com/s/files/1/0437/8220/9698/files/417057785.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/53769891797.pdf
    • https://cdn.shopify.com/s/files/1/0440/0221/4046/files/phd_personal_statement.pdf
    • https://cdn.shopify.com/s/files/1/0462/4433/1680/files/harvest_moon_light_of_hope_soleil_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/5246/6325/files/unix_shell_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/blood_group_o_negative_diet_chart_pdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_46dc87ecc9b048e3a764ab1bcb320ec0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b30166810744730a5fff6f5805142f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f4d09b9fea84cd1b14c3408aa13144d.pdf
    • https://static.usrfiles.com/ugd/40b9e6_a96d1bbec07e451f92b9150fef1e2c5b.pdf
    • https://static.usrfiles.com/ugd/c3548c_c79ff1c2fa8a406bac3c871cddd4cdda.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075f9.bin
9e1d90d12477cb7a25eac7c215ec022ec5c46614809ec891c6b1cfac41c3af13
pdf-font-stream PDF embedded font (sfnt) at offset 0x75F9 4972 bytes
font_01_sfnt_off000086f4.bin
a053a0ceb52bd2bca84a10029a57d85415919291d8f3c84ecd95e5a55fd258e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x86F4 10900 bytes
font_02_sfnt_off0000ac37.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC37 4324 bytes