Malicious PDF — malware analysis report

Static analysis result for SHA-256 3500d6073fbe22dc…

MALICIOUS

PDF

52.3 KB Created: 2020-08-17 06:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c63bb31f646efe52298032135ecd1499 SHA-1: 8780c9efb0711e0a8d2ddc88b0a572f44358bab7 SHA-256: 3500d6073fbe22dca105626a184bbb3f1be99b9deb5f305ba20211ff9c4f6c95
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the 'ttraff.cc' redirector. The document body, though heavily obfuscated, contains references to 'Cetusplay pro apk' and the malicious URL, indicating a lure for users to download potentially harmful software. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=cetusplay+pro+apk
    • http://kodaza.clevelandvoiceandsleep.com/uploads/1/3/0/8/130874431/bivaza-guwov.pdf
    • http://mokamena.ultrasoundphysicstutor.com/uploads/1/3/0/9/130969060/rewiw.pdf
    • http://vajeg.ksasteel.com/uploads/1/3/1/4/131406893/8015660.pdf
    • http://favofi.alexandracatherine.org/uploads/1/3/0/7/130739024/2163359.pdf
    • https://cdn.shopify.com/s/files/1/0439/5089/9368/files/539846509.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/mapivakulevagaluwipalimus.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/nemibadi.pdf
    • https://cdn.shopify.com/s/files/1/0438/8788/6488/files/definition_of_academic_writing.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0727/files/mirupisadasadipotujudiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/54039242865.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6115/files/sort_vs_sorted_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/6106/7428/files/bijerowovam.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/vomubevuxivitudepusa.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007070.bin
7916acd2357596352c56df523d37f60ed315eb22cd1d7c5fe7a2914556d378d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7070 4884 bytes
font_01_sfnt_off00008122.bin
0e3c84113991820528050e2ef51226641fbb6233330b051ae7e63cfec3fba305
pdf-font-stream PDF embedded font (sfnt) at offset 0x8122 14640 bytes
font_02_sfnt_off0000af58.bin
9fce2e558c7eba93e9b4ba87b790c422cf9490aab73fe875614431ac3e7f116a
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF58 16060 bytes