Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efb353c2f17f7ac…

MALICIOUS

PDF

39.5 KB Created: 2020-08-22 15:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc516afe589ec6dafe62ae158f516db1 SHA-1: 9721d8b7137194cd706b4a30aa74fcb417daf7b0 SHA-256: 5efb353c2f17f7ac782897fc6cec7e84d6147a7f3cf4aee89b365e966c0c92ec
154 Risk Score

Malware Insights

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

This PDF document contains a link to a known malicious redirector, ttraff.ru, disguised as free color sheets. The document also features a large number of embedded links to various PDF files, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a malicious intent to redirect users to potentially 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.ru/pify?keyword=free+color+sheets+of+butterflies
    • http://rapejom.tambeenaturals.com/uploads/1/3/1/4/131483254/5884ec381b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0627/9323/files/matusasipafa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/54258868775.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/tizuxetumibukuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3584/files/xojis.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2519/files/penilo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4729/6924/files/55471804766.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/avast_antivirus_offline_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4472/files/revdl_android_google_play_store_apk_html.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_off00005f01.bin
73a003f0b99a064ab764ea4a7f564781b0f514b9ead940a35ee2b0be4019e506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F01 4852 bytes
font_01_sfnt_off00006f78.bin
423530ef3b50e6f12fe0ef819a5704dd3565b786bc3b62ce3ac8423c48ec514c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F78 10008 bytes

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