Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c9108e583453c4…

MALICIOUS

PDF

40.5 KB Created: 2020-08-21 17:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe113bdb613c48438717d0f6609c4cb8 SHA-1: 74fe20490f237946e104dc5506af9c8b936427f4 SHA-256: 01c9108e583453c45cf4977d4cecb65428d122384de1dd6d7e9ce0a86723e36f
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary purpose is to redirect the user to malicious content, likely a downloader for further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=dls+2019+mod+apk+liga+indonesia
    • http://files.animspree.com/uploads/1/3/1/6/131606174/nafajiwisafapa_fofifalozodinu.pdf
    • http://mifovuz.sheplayswithmud.com/uploads/1/3/1/3/131383613/9183887.pdf
    • http://files.distinctchurch.com/uploads/1/3/2/3/132303270/volomigonebasim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/9543/6955/files/capitalism_alone_milanovic.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1617/files/nilivuketedajopus.pdf
    • https://cdn.shopify.com/s/files/1/0439/4260/9051/files/8710072270.pdf
    • https://cdn.shopify.com/s/files/1/0433/6038/7227/files/jepukixewekejawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/pearson_precalculus_textbook_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/8320/2711/files/active_directory_admin_tools_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mikawewetekiwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9037/files/android_sdk_28_gradle_version.pdf
    • https://cdn.shopify.com/s/files/1/0434/7281/4245/files/diselizujefidefu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4245/files/57637230800.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/41173245683.pdf
    • https://cdn.shopify.com/s/files/1/0428/7725/5836/files/nivuvoxepo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2657/7565/files/56978555978.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_off00005edf.bin
6dba352bfa723f25262b702c61320c78da52a70a8eeeea686f3a0e31c97de4a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDF 5728 bytes
font_01_sfnt_off00007254.bin
fcfdb26e0d97fe256c0b2aa8fb2e9af72f512620ad1c02fdc2331b8d23361a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7254 10188 bytes

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