Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad5bdb388fafdb1…

MALICIOUS

PDF

45.1 KB Created: 2020-08-06 15:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73a10700410836476acf155c87891690 SHA-1: 8445eed41debed064333f189d57d449eca984167 SHA-256: 5ad5bdb388fafdb17b5838de27a1322587f7513861a91b7820ef8ea157392fbe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a title related to a manual, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector URL indicates an attempt to lead the user to harmful 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.com/pify?keyword=manual+cade+simu+2.+0+portugues+pdf
    • http://files.thetorrancecarpetcleaners.com/uploads/1/3/1/3/131381605/6defc5.pdf
    • http://files.girls-build.org/uploads/1/3/0/8/130813054/1be696ecbdb.pdf
    • http://fexal.shopscarletgypsies.com/uploads/1/3/0/7/130739430/vimelapukigu.pdf
    • http://wexosir.interactivevideomarketing.net/uploads/1/3/0/7/130775971/029a19b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
    • https://cdn.shopify.com/s/files/1/0434/9489/9864/files/27658013166.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/98379265094.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/nujusevomovajuwutasafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31240515614.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/sixaxodid.pdf
    • https://cdn.shopify.com/s/files/1/0428/8479/2479/files/dofolama.pdf
    • https://cdn.shopify.com/s/files/1/0433/8250/5637/files/foximesabitikev.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/1563992629.pdf
    • https://cdn.shopify.com/s/files/1/0431/9523/6509/files/90907725696.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/pdf_autoestima_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/21448396525.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006134.bin
fc5f42561750052acee58764ec01ad11244c4e0e81d0c62977654a8aa3e21e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6134 5668 bytes
font_01_sfnt_off00007460.bin
e8665b067f812bb742870449188d3a14598450d8550e30d22c0d3e70ab2b7b2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7460 10660 bytes
font_02_sfnt_off000098be.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98BE 4324 bytes

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