Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b9d56054b45b39…

MALICIOUS

PDF

43.4 KB Created: 2020-08-20 04:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1d8ee82e4b4760a62c4b9e52598db98 SHA-1: acb6a74777fc547f5b0aa2428a2643705ee99787 SHA-256: 83b9d56054b45b39b8e098fe5b316adb03f274d518e968870ea218c7bdb89c3b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a redirector, which in turn likely leads to malicious content. The presence of a large number of external links suggests an attempt to distribute malware or phish users through a link farm.

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=angry+birds+space+2+mod+apk
    • http://files.ianshermanlcsw.com/uploads/1/3/2/6/132695755/toliruwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/gives_you_hell_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/57235011803.pdf
    • https://cdn.shopify.com/s/files/1/0453/9623/0312/files/workplace_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0286/files/sixinigidepez.pdf
    • https://cdn.shopify.com/s/files/1/0437/0979/2407/files/61738159727.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/lunifejigurogiweribarex.pdf
    • https://cdn.shopify.com/s/files/1/0431/6279/6186/files/cambridge_primary_science_curriculum.pdf
    • https://cdn.shopify.com/s/files/1/0434/5679/0678/files/better_discord_custom_css_background.pdf
    • https://cdn.shopify.com/s/files/1/0437/2991/1957/files/bafg_berlin_formblatt_3.pdf
    • https://cdn.shopify.com/s/files/1/0429/5622/6716/files/20477643484.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/6919990378.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_off00006afe.bin
aedf2b7459f8f16e7c29cffa9e58c533d7d10a7231132aa7d9299496aaac5106
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFE 5788 bytes
font_01_sfnt_off00007e97.bin
a8aa3bfbcde1813414f8490de689ad3434253057c047267a0df94511219dde5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E97 10092 bytes