Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f4c51a20e617bf…

MALICIOUS

PDF

50.8 KB Created: 2020-08-30 22:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 986b38eb72eb2ffbb515859c40253ea9 SHA-1: 0f1a61656bc9469b01d4d4554a94fd2905954a37 SHA-256: 02f4c51a20e617bf7420b206f7a23320f69771d34d9598469cd8b6dbcde50c58
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for educational content, likely to trick users into clicking the malicious link. No scripts were extracted, but the presence of numerous links points to a phishing or malware distribution attempt.

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/wix?keyword=ejercicios+matematicas+6+primaria
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3e87bf_07f44ca4d99e4d8a9340782a1a5c8e2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d89d6439cac4a22ace7d31827e05513.pdf
    • https://static.usrfiles.com/ugd/1e4819_2ab847803dfc4f129f7318cad99e09aa.pdf
    • https://static.usrfiles.com/ugd/b88e3d_33f4a868c8ef421aba25a27f5826595e.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/brother_mfc-_l2700dw_manual.pdf
    • https://cdn.shopify.com/s/files/1/0452/3737/1040/files/reasonable_accommodation_form_apartment.pdf
    • https://cdn.shopify.com/s/files/1/0437/7785/1553/files/fca_suayed_unam.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0921/files/41791854176.pdf
    • https://cdn.shopify.com/s/files/1/0434/5331/7272/files/bozepofoxul.pdf
    • https://cdn.shopify.com/s/files/1/0436/1188/1634/files/evento_cerebrovascular_isquemico_y_hemorragico.pdf
    • https://cdn.shopify.com/s/files/1/0459/7311/0951/files/dakojubonug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53446206952.pdf
    • https://cdn.shopify.com/s/files/1/0431/5788/0996/files/welodepozukuni.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006007.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6007 6440 bytes
font_01_sfnt_off00006ffb.bin
1fc4c4eaf1927b50d246e0bfbfa909be6b8aaf2df171aa4ccc9fd513b2dea9f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFB 5236 bytes
font_02_sfnt_off000081b1.bin
d7b3ec938f63ddba26a3fb52484b5ed6586114d98f3a7740b633a30d7f0b1502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B1 11136 bytes
font_03_sfnt_off0000a631.bin
085576db18bb0fc782250241abecc7e2760275121a9b893a05600fa9329c440f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA631 16328 bytes

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