Malicious PDF — malware analysis report

Static analysis result for SHA-256 1896f3733849e14e…

MALICIOUS

PDF

44.7 KB Created: 2020-08-22 01:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 888caa6dc64d566bb3956867f51efd22 SHA-1: 892f354ba9e01e6864a6d61fd9fec567e49ef57a SHA-256: 1896f3733849e14ebc9d7912602e7e8786dd9dcde9e650319595bf99aa14b204
154 Risk Score

Malware Insights

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

The PDF contains a link farm of numerous external PDF links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. The embedded URLs suggest an attempt to manipulate search engine results or redirect users to malicious content, likely as part of a phishing or scam campaign.

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=functional+design+specification+template
    • http://fodomaki.thecolororacle.com/uploads/1/3/0/8/130874540/rojubemawodu-guxuwegof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2670/1723/files/comparing_fractions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/2625/0917/files/icecream_split.pdf
    • https://cdn.shopify.com/s/files/1/0429/8211/3433/files/53324382583.pdf
    • https://cdn.shopify.com/s/files/1/0435/4025/0775/files/film_avatar_bluray_720p.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/2000_chevy_silverado_repair_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3354/9205/files/communication_round_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/7047/8746/files/sinukegolasokezobojejuto.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/4505249269.pdf
    • https://cdn.shopify.com/s/files/1/0437/0009/3083/files/menafalotasaturifaxifun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0438/8959/0427/files/good_news_bible_apk_offline.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_off000060ed.bin
64fd7b95659e225c0b5869e95aeb894c18a37ec063153cf6df7ea9b2adad2193
pdf-font-stream PDF embedded font (sfnt) at offset 0x60ED 5332 bytes
font_01_sfnt_off00007301.bin
ccba772b85a7c47de77c800f5514d0841b04bba2c85f528a44cf529bdc37eaf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7301 15752 bytes