Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5a735cab90861a…

MALICIOUS

PDF

37.1 KB Created: 2020-08-23 04:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2011511763447c36d03a52135db9a715 SHA-1: d6688bf42d2810f4ddc90f7f8e31697c9d71d181 SHA-256: 3d5a735cab90861a08aa8c12963bb70d0fda9f1db55e9ef8f4c4de08b98b4a67
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as search results, with the primary malicious link being https://ttraff.com/pify?keyword=hollywood+animation+movie++in+300mb. This link likely redirects to a malicious site or download. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains multiple embedded URLs pointing to external resources, some of which are benign but others are unknown or malicious.

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=hollywood+animation+movie++in+300mb
    • http://files.briannecmartin.com/uploads/1/3/0/7/130739153/410f6cbdd1b.pdf
    • http://files.piperfayephotography.com/uploads/1/3/1/4/131453904/wasilifuta.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/pefumofogen.pdf
    • https://cdn.shopify.com/s/files/1/0454/5983/2982/files/alta_via_2_dolomiti.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/12346795131.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/zasofevuro.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/avatar_the_last_airbender_french_dub.pdf
    • https://cdn.shopify.com/s/files/1/0438/6550/5952/files/jonubesovijopurazafo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4978/7285/files/zoterawubasarekujupijul.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/82517939561.pdf
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/58270990390.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_off0000540c.bin
9b3aa239815f636c82f33d75b7d171477708950fe2e89d9f0a38b92f3d47efd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x540C 5360 bytes
font_01_sfnt_off00006652.bin
a1f614fa00f086b1ca5ac0bdf4453e6c7742152578f486a4dd5c897e5ee4d247		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6652 10008 bytes

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