Malicious PDF — malware analysis report

Static analysis result for SHA-256 741fe115f0f5beb5…

MALICIOUS

PDF

39.0 KB Created: 2020-08-21 03:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b51d4b26602e21a3e5445e374bf675b SHA-1: 39024d47349def12c207cebc1b878d1092819998 SHA-256: 741fe115f0f5beb5d789a091660ff86d0a5e13835bb1f5e6f23e0db544bc6af7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to direct users to potentially harmful content. The document body, though partially corrupted, contains text related to 'tracing sheets' and URLs, reinforcing the lure.

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.cc/pify?keyword=abc+practice+tracing+sheets
    • http://files.yvccolumbiasc.org/uploads/1/3/0/8/130813357/3e1d583.pdf
    • http://files.jackyuhuazhou.com/uploads/1/3/0/9/130969798/kononok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/8220/9698/files/convert_html_to_using_php.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/rorasisezopiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3640/files/zasugazeweget.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86662201832.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/gusuvanexugotoguto.pdf
    • https://cdn.shopify.com/s/files/1/0433/7260/9686/files/81083927645.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13164506765.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7394/files/filomewuwogagolugibin.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/74199849921.pdf
    • https://cdn.shopify.com/s/files/1/0447/1390/2234/files/35997546811.pdf
    • https://cdn.shopify.com/s/files/1/0439/3094/3643/files/36927464496.pdf
    • https://cdn.shopify.com/s/files/1/0431/8933/8276/files/74099427541.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_off00004e48.bin
e7956c6f211d7aeacdba179f755f372ab48d4f2de718be47ac99436566347de7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E48 4968 bytes
font_01_sfnt_off00005f14.bin
1001331e5466bdc6ea3ad4fe17ffc9dcf3c95be0c2bbc09cdcd6fc318f717bc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F14 9992 bytes
font_02_sfnt_off00008134.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x8134 4324 bytes