Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7b716be8ef3d86…

MALICIOUS

PDF

42.6 KB Created: 2020-08-13 21:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d81acbca945593116d13ed43f0c9894 SHA-1: a4d95e802f9fc20b47169e4605632550ee253cea SHA-256: cd7b716be8ef3d867012d62c92c0489b9a79922adbc2c375964bc6c42564a3af
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Ca king platform bed plans' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which point to Shopify domains hosting other PDFs, 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.cc/pify?keyword=ca+king+platform+bed+plans
    • http://files.lifebytheshore.com/uploads/1/3/1/3/131379591/figarofazadaz.pdf
    • http://files.shopcyt.com/uploads/1/3/0/9/130969548/0462c9e99.pdf
    • http://files.skirtmagic.co.uk/uploads/1/3/1/4/131409200/bb8c14db74cb9f.pdf
    • https://cdn.shopify.com/s/files/1/0441/0825/1288/files/gudowitaputilemubi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2604/6362/files/variedades_del_cafe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5852/7394/files/lodujajef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/functional_classification_of_roads.pdf
    • https://cdn.shopify.com/s/files/1/0433/2067/2409/files/korinuxobol.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/convert_to_monochrome.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27039997465.pdf
    • https://cdn.shopify.com/s/files/1/0435/9487/5039/files/personality_quiz_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/pawaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/19714939726.pdf
    • https://cdn.shopify.com/s/files/1/0440/5762/4726/files/send_text_message_from_gmail.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063d8.bin
0713172d5849c3c1e82809f9250a3f2681977003db75e56a3cbb0d4fc17e5eaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x63D8 5472 bytes
font_01_sfnt_off00007658.bin
c49678a4f3de8cddb1b170ae96ec07de5238edf8ce8ff59035e1d620590a94a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7658 11596 bytes