Malicious PDF — malware analysis report

Static analysis result for SHA-256 75588f9eef14c0bf…

MALICIOUS

PDF

65.1 KB Created: 2020-08-12 17:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fd6f083d80bebbad64bd23c1e9bb3c8 SHA-1: f261815c51cedf3f97ce300cff29959a90b801ea SHA-256: 75588f9eef14c0bf51f674f4668ac604d1e9e766c96ca4434032ba57fb4dd4ee
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious redirection scheme. The presence of numerous external PDF links also suggests a link farm or SEO manipulation tactic.

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=3m+adhesives+pdf
    • http://files.pacificshoresmusic.com/uploads/1/3/1/3/131380741/2957157.pdf
    • http://jisekura.bestkids.org/uploads/1/3/1/3/131398140/6334555.pdf
    • http://vowar.buildingbrilliantmindsonline.com/uploads/1/3/0/7/130740025/b848f8dd910e16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/7432/9499/files/turn_down_for_what_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0436/5965/7374/files/93825850975.pdf
    • https://cdn.shopify.com/s/files/1/0447/9172/6240/files/vw_jetta_manual_transmission_shifting_problems.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mijafovaginidobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/18907516852.pdf
    • https://cdn.shopify.com/s/files/1/0436/7548/4313/files/labotaxateta.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/forms_of_address_in_english_language.pdf
    • https://cdn.shopify.com/s/files/1/0434/3028/1381/files/nenavulavuvijunojeb.pdf
    • https://cdn.shopify.com/s/files/1/0454/6088/1560/files/rsmeans_building_construction_cost_data_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5b4.bin
eccaa8cfb29b4395dee6cf38462c555201cbaecdd9baed029a0b47e75348986c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 4772 bytes
font_01_sfnt_off0000c5e6.bin
6a728e608dd8e03b8662613bbc1b3f041d479404ea42c3a61811d580bb80c2b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E6 10424 bytes
font_02_sfnt_off0000e98c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 4324 bytes