Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d38aff650891e05…

MALICIOUS

PDF

38.9 KB Created: 2020-08-15 19:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31d5ffb927a58f032b480aa7c8f63952 SHA-1: eb928986cd745a717abd72625570dc9e48d2bb28 SHA-256: 1d38aff650891e057d21272d240cd50ceda6660ca17c374534e0f7e6d143565e
152 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, which is associated with malicious infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly supports the malicious verdict. The primary attack vector appears to be redirecting users to potentially malicious or phishing content through a network of links.

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=contemporary%20polymer%20chemistry%203rd%20edition%20pdf
    • http://files.katiekittrell.com/uploads/1/3/1/0/131070723/a3a603cf61.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9499/files/36733953457.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/aerogarden_6_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/62585941005.pdf
    • https://cdn.shopify.com/s/files/1/0430/3912/9751/files/netamalupuxilona.pdf
    • https://cdn.shopify.com/s/files/1/0427/9002/7430/files/40515109576.pdf
    • https://cdn.shopify.com/s/files/1/0434/4247/1064/files/marlin_model_60_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7001/9998/files/notifier_conventional_smoke_detector.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7495/files/manualidades_para_nios_de_3_a_5_aos.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/moneme.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7557/files/definicion_de_materialismo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/lowitopeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/zozafabopubexokobobabekam.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_off00005970.bin
ec91528211556b3702f2bf1eebdd60e86a1a32b849b7d95b627622a40c3bf8f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5970 5564 bytes
font_01_sfnt_off00006c2e.bin
20957df582df7ea1c97cb7c44e5720b2dfcd8a0ed969052c335dda4ef8351b28
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2E 10176 bytes