Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc055dc63d18db9…

MALICIOUS

PDF

61.9 KB Created: 2020-08-06 16:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f20e9ad04361698c43692ccf28246ce SHA-1: 487ab9537dfa0be630e8309143b9334d291509b8 SHA-256: 7cc055dc63d18db969b834d13dc0a96582c52b723a107e6d7a09aee2605a4b3e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL. The presence of numerous external links, many pointing to Shopify domains, suggests an attempt to obscure the ultimate destination and potentially leverage legitimate platforms for distribution.

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=historia+biblica+de+jose+completa+pdf
    • http://files.headstrongequestrian.com/uploads/1/3/1/4/131411688/loropixozovazotur.pdf
    • http://files.brendaknows.org/uploads/1/3/1/3/131382134/eb431082870fc8f.pdf
    • http://files.porterrc.com/uploads/1/3/1/4/131407012/4301461.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/68440724074.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/6021299015.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/47742973828.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/76010848470.pdf
    • https://cdn.shopify.com/s/files/1/0430/3260/8921/files/8493312582.pdf
    • https://cdn.shopify.com/s/files/1/0432/7420/7387/files/64312777704.pdf
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/sifena.pdf
    • https://cdn.shopify.com/s/files/1/0431/6607/2994/files/pofowu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasidobedibugamis.pdf
    • https://cdn.shopify.com/s/files/1/0430/0747/5875/files/gabukaganiterulasoduje.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/babixasegubewoga.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_off00008fef.bin
f0bf161cfa60f5255e394a458d56704bd87879abffd4c68de1ab9a56ab08e3c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FEF 5476 bytes
font_01_sfnt_off0000a273.bin
e667c7dd49483f974fb1b4cfc43e26e8daee84db08f7a771489adae7e440a457
pdf-font-stream PDF embedded font (sfnt) at offset 0xA273 13972 bytes
font_02_sfnt_off0000d00d.bin
6c811f52d9d424b114e61cef7b2a0d4e2f609d758ed65ce1597ffa53e7b131b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD00D 17264 bytes