Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b1b3524ed55648…

MALICIOUS

PDF

41.2 KB Created: 2020-08-18 21:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a387ab67b76dfa519ceaa0cf1388a4ac SHA-1: b558a385754879764ca6bff6d591f564df4f4e43 SHA-256: 10b1b3524ed556481694e3c6a144d46c82c063fdf9042b4960b2cad15b51b7cb
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, including a critical redirector link to 'ttraff.com'. The document body, though heavily obfuscated, contains text suggesting it is a 'calendar template for pages mac', which is likely a lure. The presence of many external PDF links and a malicious redirector indicates an attempt to drive traffic to malicious infrastructure, potentially for phishing or malware delivery.

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.com/pify?keyword=calendar+template+for+pages+mac
    • http://files.mrsras.com/uploads/1/3/2/7/132712355/gofiwaxomis.pdf
    • http://files.climbireland.com/uploads/1/3/1/4/131408798/sonetazizufu_siwonesip.pdf
    • http://files.kimkirch.com/uploads/1/3/0/7/130775827/welobozutudirol-fulunim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8807/5159/files/k_lite_codec_pack.pdf
    • https://cdn.shopify.com/s/files/1/0438/9827/3944/files/guidepost_montessori_at_prosperity_reviews.pdf
    • https://cdn.shopify.com/s/files/1/0430/7822/1973/files/piwuvonazuxizowipako.pdf
    • https://cdn.shopify.com/s/files/1/0432/8466/0380/files/14504088349.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/xogonar.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/17632915998.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/47446847387.pdf
    • https://cdn.shopify.com/s/files/1/0433/4678/8502/files/losujewamigolufinivenej.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/candombl_no_brasil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/dukadaloriduxoxamiduk.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_off000063ca.bin
85379d651ca29cbe1154bee7efff493b21da2a14a299bf278ed52b5b34c01255
pdf-font-stream PDF embedded font (sfnt) at offset 0x63CA 5380 bytes
font_01_sfnt_off00007606.bin
09d31ab8d34c5eeee736f8cdd97e368affc65a6d64e0c52a4851f6e4c67bc7fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7606 9956 bytes