Malicious PDF — malware analysis report

Static analysis result for SHA-256 900f4be042d65c7b…

MALICIOUS

PDF

42.1 KB Created: 2020-08-07 21:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a5127717d81f8ee77bb81a2930de0f SHA-1: 2be0a2e492bd3971948c4474b9eb697eb811bb31 SHA-256: 900f4be042d65c7b800fe6e6c5432437f878c3f5926b7f5006e00eda2bf8ed8a
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link redirects through ttraff.com, which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and a reference to 'A4 size paper with lines and border pdf', suggesting a lure to disguise the malicious link. The presence of numerous external links, including the malicious redirector, indicates a link farm or redirection strategy to obscure the final malicious destination.

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/pify?keyword=a4+size+paper+with+lines+and+border+pdf
    • http://files.bwfraser.com/uploads/1/3/1/3/131398235/27b50f.pdf
    • http://lofaw.superfectiondesign.com/uploads/1/3/1/3/131383544/5194158.pdf
    • http://files.boondhs.com/uploads/1/3/1/6/131637714/xijeloditu.pdf
    • http://masujufa.harmonythatmatters.com/uploads/1/3/2/3/132303410/pitosafepi.pdf
    • http://files.rivolirallies.com/uploads/1/3/0/8/130874360/davozamiw_dopukadi_wasukujagi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9560/files/nizifozegafo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3399/files/1650453945.pdf
    • https://cdn.shopify.com/s/files/1/0438/8408/5416/files/66631694919.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/gazedalanelepolop.pdf
    • https://cdn.shopify.com/s/files/1/0437/0992/3480/files/lipatajimus.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/bejiwi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/puwuwevorurepoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7079/1573/files/67910117989.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/62635957816.pdf
    • https://cdn.shopify.com/s/files/1/0429/6504/1311/files/oasis_ecfmg_login.pdf
    • https://cdn.shopify.com/s/files/1/0437/5206/3125/files/path_of_exile_ranger_build_beginner.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/33465388257.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_off00006494.bin
018b419aac3b1c7b62215a3c92ea8608eaf19e6fe32ef9d0b9032fdcbe3dda5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6494 5488 bytes
font_01_sfnt_off00007752.bin
95d35a5b34a68f06032c8b51da39677123886b2ed3fdcac18b5fc4ce9e7456c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7752 10068 bytes

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