Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d204e589c83c38…

MALICIOUS

PDF

47.2 KB Created: 2020-08-08 12:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dabb72d4e6b0d43494d26cadb1dbba0f SHA-1: 94c510a83402c6479637f214b829ab17b07fb5bb SHA-256: 35d204e589c83c3898f08b93e9c2f528794628ffeeb710adef98437ab34784bf
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. This URL is used to redirect users to other potentially malicious PDF files hosted on various domains. The ML classifier also strongly flagged this PDF as malicious. The document body contains the same malicious URL, reinforcing the lure to click on it.

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.ru/pify?keyword=electrical+installation+symbols+bs+3939+pdf
    • http://files.ohiospfrx.com/uploads/1/3/1/8/131871466/bibisirujibule_wopemazidadowaz.pdf
    • http://winolifi.majresearchgroup.com/uploads/1/3/1/3/131378776/vulufenigasi.pdf
    • http://files.my-medicare-insurance.com/uploads/1/3/0/8/130873918/vofomemukilo_zumeroxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37394074323.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/99436715044.pdf
    • https://cdn.shopify.com/s/files/1/0436/9966/7099/files/48981195849.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/tepiko.pdf
    • https://cdn.shopify.com/s/files/1/0437/6389/2376/files/92404472651.pdf
    • https://cdn.shopify.com/s/files/1/0440/2121/9493/files/64550979192.pdf
    • https://cdn.shopify.com/s/files/1/0433/7798/3653/files/zivudonuditoga.pdf
    • https://cdn.shopify.com/s/files/1/0434/6881/6544/files/85036713290.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/88188135541.pdf
    • https://cdn.shopify.com/s/files/1/0430/9860/3669/files/38725654037.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006795.bin
2e7d226eec261d06ea4bf30b956dfe5e6d0a8f1e56cb595c3d55b08b53406382
pdf-font-stream PDF embedded font (sfnt) at offset 0x6795 5608 bytes
font_01_sfnt_off00007a7d.bin
42fb11ec4ae297484a41c674059ae2f37456100366ee5e2736d36e2735cd607b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7D 12096 bytes
font_02_sfnt_off0000a169.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0xA169 4324 bytes