Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7d3d8d77dadc47…

MALICIOUS

PDF

49.5 KB Created: 2020-08-20 01:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4b657065abdd2da16c72cf0424b6779 SHA-1: adfc109307b8e62891d11d2d9e1a6196d45cf453 SHA-256: be7d3d8d77dadc47281ed52639e2b3dba320e41b4d65626b7abb4b89e92ad4b7
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=book+for+learning+japanese+pdf', suggesting a lure to a malicious site. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many hosted on cdn.shopify.com, which are likely part of a link farm to improve search engine ranking for malicious content.

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=book+for+learning+japanese+pdf
    • http://files.brooksidestable.com/uploads/1/3/0/7/130776277/6be61d551d.pdf
    • http://nowazoj.dimmittchamberofcommerce.com/uploads/1/3/0/8/130814328/razoka_zepedonekuxab_ponajuziwa_beniwoxedapotew.pdf
    • http://nipavig.clarelouiseburnett.com/uploads/1/3/1/4/131437363/gibazebowujes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6479/5044/files/lisowugenuwepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/blanchard_macroeconomia_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0436/3082/1529/files/sejobogalaful.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/regajewoji.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5602/files/sebozuxitef.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/32954122297.pdf
    • https://cdn.shopify.com/s/files/1/0430/0305/2191/files/anime_apk_firestick_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/65054905494.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/expanding_tactics_for_listening_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2831/files/xalufo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0553/2569/files/vefidojakusefubo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/52660785765.pdf
    • https://cdn.shopify.com/s/files/1/0437/5203/0357/files/rejawoji.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_off00006d41.bin
c8a2f77fb2f216349f176eb8c5fa21633df2188711af42e1c4b77ca9f2f5162d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D41 5400 bytes
font_01_sfnt_off00007fb0.bin
6a6719fd18ec18f9cf1edaa305c6d2ebdddafb331a1fd489e169c035d0b1839a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB0 10640 bytes
font_02_sfnt_off0000a438.bin
28b54622314fe970c10f0b8fb2e7509d8ab364d8e49f98911ef247a77c086d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA438 16076 bytes

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