Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bac1fe35229a88…

MALICIOUS

PDF

46.1 KB Created: 2020-08-08 05:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2202904a7654ddedcc7c5241228c1d22 SHA-1: 4a39fb999a030c16427886906a82722b7a2affc5 SHA-256: 39bac1fe35229a88217bf99b9cc91abac657ae5ffcd02e1c429000628f5ffa2d
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, masquerading as academic content. One of these links redirects to a known malicious domain, ttraff.com, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as 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=catastrophism+and+uniformitarianism+pdf
    • http://files.skycruiseandtravel.com/uploads/1/3/0/7/130775156/mutoweximononu-puteposelo-majibanarabipo-nakurosejexav.pdf
    • http://files.risingravenband.com/uploads/1/3/1/3/131384018/buvab.pdf
    • http://files.northernmarineinc.com/uploads/1/3/0/8/130813732/vifamalid.pdf
    • http://files.shimmerwalls.com/uploads/1/3/0/8/130814687/putukanimewume_kenisarone.pdf
    • http://files.roustemis.com/uploads/1/3/2/6/132682063/df74616f1a0.pdf
    • https://cdn.shopify.com/s/files/1/0429/6251/8182/files/lisowomigu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7672/files/zuwowo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1311/files/55656622957.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/nuzisuteli.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9430/files/jikapobabefobexadomife.pdf
    • https://cdn.shopify.com/s/files/1/0436/5425/0654/files/25702669556.pdf
    • https://cdn.shopify.com/s/files/1/0439/0522/0776/files/22146140212.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/96326003896.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6507/files/zubadizuxup.pdf
    • https://cdn.shopify.com/s/files/1/0431/9854/6084/files/danelab.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/sleep_disorders_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6411/files/feganirereza.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_off00007139.bin
6ff3e0cbacf785961a81aa13a554bbfdf68d512f11a45445523b5be5d610b1bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7139 5152 bytes
font_01_sfnt_off0000828f.bin
0a8abe5667d6862b5d2c777c9a84de92d826bab83945e5d3a8be7d290559fda1
pdf-font-stream PDF embedded font (sfnt) at offset 0x828F 13092 bytes