Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdddf4c24b678d54…

MALICIOUS

PDF

40.8 KB Created: 2020-08-10 21:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3d57ca58259e8996d421fc105dc9364 SHA-1: 5851daf00b653f842f03a91effb5f4e230b68286 SHA-256: cdddf4c24b678d541a7f23b04dd5421a7ec2ed857bf37f7a5089c560dc912ec7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, many pointing to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain (ttraff.cc). This indicates a link farm or redirector strategy to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click a link that ultimately leads to a malicious site, likely for phishing or malware delivery.

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/pify?keyword=reduced+adjective+clause+exercise+pdf
    • http://files.waitaraponyclub.com/uploads/1/3/1/3/131398374/bemebiwiti.pdf
    • http://files.rothe-photography.com/uploads/1/3/1/8/131856602/f221397bd63a509.pdf
    • http://files.thepdavisphotography.com/uploads/1/3/1/3/131380213/lobalat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10699911966.pdf
    • https://cdn.shopify.com/s/files/1/0429/1257/9747/files/jisufomewasupovezaso.pdf
    • https://cdn.shopify.com/s/files/1/0447/7108/2391/files/optical_isomerism_iit_jee.pdf
    • https://cdn.shopify.com/s/files/1/0431/6371/3690/files/fomuludodofesamesipa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5252/3929/files/23307586799.pdf
    • https://cdn.shopify.com/s/files/1/0439/5070/2750/files/begalizakixoda.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/bilal_ibn_rabah_biography.pdf
    • https://cdn.shopify.com/s/files/1/0437/8093/1733/files/ruzevoxupafoda.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/55907145745.pdf
    • https://cdn.shopify.com/s/files/1/0438/3126/3394/files/jotekudoraza.pdf
    • https://cdn.shopify.com/s/files/1/0438/9706/1531/files/wuduzutitikaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7613/2774/files/ielts_vocabulary_words_with_meaning_in_punjabi.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_off00006136.bin
442cd777cd26a2b316bd4442a523baef0188deb73d48eaacb7bd0538f933fd47
pdf-font-stream PDF embedded font (sfnt) at offset 0x6136 5360 bytes
font_01_sfnt_off0000738c.bin
c9a183fc476d184b726b05c2df049ca7656a02cf1d8da8516f7a969cc6db4335
pdf-font-stream PDF embedded font (sfnt) at offset 0x738C 10136 bytes