Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db2911402f04c09…

MALICIOUS

PDF

35.1 KB Created: 2020-08-18 14:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56894fa9517472eeec1d79c544a54c13 SHA-1: 3821d5e032ddb8012003b16c3aa0e536975d0ac4 SHA-256: 6db2911402f04c090b2cca88a0b49b8d1fc98b1e82c39fe6cd28a4d05ca077d9
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is known malicious infrastructure. It also contains a PDF link farm heuristic, indicating a large number of outbound links. The document body contains the URL 'https://ttraff.com/pify?keyword=nds+emulator+android+apk+2019', suggesting a lure to download an emulator. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an attempt to redirect users to malicious sites.

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=nds+emulator+android+apk+2019
    • http://perogug.gabgains.com/uploads/1/3/0/8/130874063/bukazivo_dowurimikemeja_wekojajuvi_fejidibemoj.pdf
    • http://files.paulsfranchiseleague.com/uploads/1/3/1/4/131438249/kabuvoxije_kuvorenuzixuw_raxejusub.pdf
    • http://files.b-wellnow.net/uploads/1/3/0/7/130776795/kitadibov-jubojot-bajonure.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1664/0919/files/applebee_s_jobs_application.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/1038821431.pdf
    • https://cdn.shopify.com/s/files/1/0432/9275/4080/files/75636528250.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/coulomb_s_law_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0437/1801/7175/files/agastya_samhita_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0429/0582/9532/files/tuxex.pdf
    • https://cdn.shopify.com/s/files/1/0432/2711/9784/files/mercedes_a_class_brochure.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_off00004a2e.bin
5c2fa7049ecef69fc2c589bd21dffb89aec076922d645f34891a1e75d5ddc9db
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A2E 5620 bytes
font_01_sfnt_off00005d38.bin
044e56c286c960992afa1a6b8f4ad22056654164fb27aad365046568444187fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D38 10328 bytes