Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de950d5546b04a4…

MALICIOUS

PDF

39.8 KB Created: 2020-08-24 02:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa647277acbfed02bbb3087f07ac57bc SHA-1: ad6c38c9910516a699df4f0ed6e36570b582fc89 SHA-256: 5de950d5546b04a452c979832b5ad0cf54961b9c131428e4ad4f7b8c799bc9f6
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body and embedded links suggest a lure related to 'VPN master for windows 7 free', likely intended to drive traffic to malicious sites or download further payloads. The ML classifier strongly indicated maliciousness.

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=vpn+master+for+windows+7+free
    • http://files.impact2020conference.com/uploads/1/3/1/6/131637043/51a319c1df3.pdf
    • http://files.fanhubnw.com/uploads/1/3/1/8/131857445/jelim.pdf
    • http://files.smcteamc.org/uploads/1/3/1/4/131407469/karaxawezezane-raranabijugup-venisabu.pdf
    • http://files.thetrendylegacy.com/uploads/1/3/0/7/130776864/radimojak.pdf
    • http://tejur.sghock.com/uploads/1/3/2/3/132302868/3436268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0544/4259/files/cracking_codes_with_python_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/69276255886.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/tewetarinigedufafiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61238086127.pdf
    • https://cdn.shopify.com/s/files/1/0441/4128/1432/files/comodo_antivirus_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/3092/1895/files/cerfa_13750_x_02.pdf
    • https://cdn.shopify.com/s/files/1/0430/0062/7363/files/types_of_nanosensors.pdf
    • https://cdn.shopify.com/s/files/1/0438/9348/9832/files/zikojagojalipupato.pdf
    • https://cdn.shopify.com/s/files/1/0432/7161/8723/files/29281619044.pdf
    • https://cdn.shopify.com/s/files/1/0429/8817/5513/files/visafufezogajofireke.pdf
    • https://cdn.shopify.com/s/files/1/0436/1990/9794/files/ap_biology_campbell_8th_edition_test_bank.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_off0000527e.bin
02201fdaf2752f4422f7629c71039e5f766ffabbddac837aa70011d2fb945b01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x527E 2828 bytes
font_01_sfnt_off00005c88.bin
a0e056f8b91262b8d4991f099234ef251e0cffb0bdb9408b4b469340c2859c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C88 5292 bytes
font_02_sfnt_off00006e82.bin
413e8245c244f9876db29db1d991a8db6e75ab76e6a1a3548864dd9e8351a6ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E82 10316 bytes

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