Malicious PDF — malware analysis report

Static analysis result for SHA-256 399a0410e87e1c34…

MALICIOUS

PDF

35.2 KB Created: 2020-08-11 21:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33d96bae271d542fbd4d18eae2225182 SHA-1: 231add8f08c23d8eb1aea01ca09cb536235c59f9 SHA-256: 399a0410e87e1c344cd90ec1c8135d4815ec86b3a77399062cd374f89c63998f
152 Risk Score

Malware Insights

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

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 'https://ttraff.com/wb?keyword=cookies%20week%20book%20pdf'. This suggests a phishing or scam attempt where the user is enticed to click the link under the guise of accessing a book PDF, leading them to malicious infrastructure. No scripts were extracted from this sample.

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/wb?keyword=cookies%20week%20book%20pdf
    • http://files.thomascharlesbryda.com/uploads/1/3/0/9/130969855/mogogu.pdf
    • http://files.usawesley.net/uploads/1/3/2/6/132695321/740eba6a29e.pdf
    • http://bobivogu.afmsptsa.org/uploads/1/3/2/6/132682883/woravararip_vunaw_darajusagekelo.pdf
    • http://files.lawofficesofmarkjcarrollpllc.com/uploads/1/3/2/6/132682048/5c87ebfd2d932.pdf
    • https://cdn.shopify.com/s/files/1/0427/7587/1654/files/88288616863.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/24506514372.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/72724711611.pdf
    • https://cdn.shopify.com/s/files/1/0440/7217/3733/files/ejemplo_de_acta_constitutiva_de_una_sociedad.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/33837124503.pdf
    • https://cdn.shopify.com/s/files/1/0440/3986/4485/files/gerenorakolububed.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/munulexalima.pdf
    • https://cdn.shopify.com/s/files/1/0433/6104/2591/files/energy_profile_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/votejexiki.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_off00004d1d.bin
460fa916ea9e2c1efabf9aaaa8524160b87982678df1b9199b27e5d49f140465
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D1D 4900 bytes
font_01_sfnt_off00005de9.bin
93ec441298aa0b698c636c84df9262cc5d39a688910a33bc78a90126c3257853
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE9 10024 bytes