Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c3dd12867a634e…

MALICIOUS

PDF

41.0 KB Created: 2020-08-21 03:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ecd7fb0399fe09b0c1b1340fdac1163 SHA-1: a2a07dba93508f8b7c20e3462102df80ee2c59b9 SHA-256: 64c3dd12867a634e0302547679d9f799cdf54612643a939da02e1099444eddea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for users interested in report writing. The ML classifier strongly indicates maliciousness, supporting the attack pattern.

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=how+to+create+report+writing
    • http://files.aliveleadership.com/uploads/1/3/0/7/130775014/navajifog-wewizenolifi.pdf
    • http://files.sonjanagy.com/uploads/1/3/1/3/131384635/3023831ee0.pdf
    • http://files.streetfightersunitedkingdom.com/uploads/1/3/1/4/131437878/3c353d051f22fd3.pdf
    • http://wiwosur.fomuchskateboards.com/uploads/1/3/0/8/130814017/8363154.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5136/8104/files/html_grid_template_areas.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/miweduvonef.pdf
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/lajemotimezufedaporuzol.pdf
    • https://cdn.shopify.com/s/files/1/0439/4162/6011/files/3054267804.pdf
    • https://cdn.shopify.com/s/files/1/0432/0958/8897/files/bsc_nursing_form_date_2019_lucknow.pdf
    • https://cdn.shopify.com/s/files/1/0432/0018/4477/files/pdf_epub_to_kindle_tool.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/27391234041.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/wowegabefosuzojanikez.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5340/files/2823177797.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/57898335583.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/xifosikalulip.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006338.bin
2ff14a327708721c54268af882c03511c9631f9bdb13071faa617c54319ce49b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6338 4944 bytes
font_01_sfnt_off0000742b.bin
dbc1987e28924574ae587866029f5d926a78b43f458795d3429ec668c08eaae6
pdf-font-stream PDF embedded font (sfnt) at offset 0x742B 10272 bytes