Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac9606545b933b9…

MALICIOUS

PDF

44.9 KB Created: 2020-08-20 02:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ceafd9b44bfb83325c7284a06aeedda SHA-1: 037092b234527cc635496744778bf3e9882badef SHA-256: 6ac9606545b933b92e8da5f86b5197c3565e8791dd2b33d002a37ab5a4b2345f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. The presence of numerous links and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful 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=english+grammar+revision+exercises+pdf
    • http://suberi.shermanoakstherapyandrecovery.net/uploads/1/3/1/4/131408854/3747085.pdf
    • http://files.msterryportfolio.com/uploads/1/3/1/3/131381614/rariw-momakisosen.pdf
    • http://saxazereb.secondcitystationery.com/uploads/1/3/1/4/131409909/24ef89.pdf
    • http://xenituf.hbcuaccessories.com/uploads/1/3/0/7/130776428/696819.pdf
    • http://files.edlplayz.com/uploads/1/3/1/4/131409210/b79eac90b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/5883/7142/files/1-_99_cooking_guide_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0831/files/12796858930.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0047/files/ragunoxotunavewab.pdf
    • https://cdn.shopify.com/s/files/1/0435/5876/4696/files/how_to_make_bookmarks_appear_automatically_in.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4854/files/bransden_joachain_quantum_mechanics_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/vunezigikaxozanebusuxum.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2347/files/22240316969.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0047/files/14072134491.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/78768037748.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/balopebafe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5724/9430/files/form_attribute_html_button.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/dosalukolaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8720/files/kolakoletixegeteke.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_off000061f1.bin
cfc87a67c27d2db1e779038a66e6beb1dd1798bcb3a3a79a97b6ae9c30864e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F1 5364 bytes
font_01_sfnt_off000073fa.bin
a1f388c7e4d9463230b1fe53173d16cf1e70d66e7f84b1fdbf9087c5e8ced6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FA 10776 bytes
font_02_sfnt_off00009821.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9821 4324 bytes

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