Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b234b41e9220f7d…

MALICIOUS

PDF

41.7 KB Created: 2020-09-04 17:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 051cc774de2eedca18aa6e446c978cd5 SHA-1: bd023440cf46761cce0ffb66f909f86351558b71 SHA-256: 2b234b41e9220f7d3893ed2a1fb7f90baf19d624efbc47c40d7b0cb76b3ea877
150 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, disguised with a lure related to 'facebook messenger sound clip'. This indicates a phishing or social engineering attack. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing confirms the malicious nature of the redirector. The ML_NYX_PDF_MALICIOUS score further supports the malicious classification. The document body, though heavily corrupted, contains the malicious URL and a reference to 'facebook messenger sound clip', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.club/wix?keyword=facebook+messenger+sound+clip
    • https://static.usrfiles.com/ugd/b8c837_d81f833b75114566a4bd516ed14344cd.pdf
    • https://static.usrfiles.com/ugd/3e9e83_f1c683effec949c1a6ddc919660e2ac5.pdf
    • https://static.usrfiles.com/ugd/fa32a6_35cf7b45e5b64593b80940b6a9cdef13.pdf
    • https://static.usrfiles.com/ugd/d32f78_7f9f37bafbb1447a80b9058f528728d7.pdf
    • https://static.usrfiles.com/ugd/e643da_a56677fc60754273a260a3952c40d806.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1751/files/wiwijerobi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/85234525616.pdf
    • https://cdn.shopify.com/s/files/1/0452/5208/3869/files/31139614271.pdf
    • https://cdn.shopify.com/s/files/1/0435/5578/2819/files/muwamapebewiba.pdf
    • https://cdn.shopify.com/s/files/1/0434/7622/2114/files/perbedaan_tanaman_c3_c4_cam.pdf
    • https://cdn.shopify.com/s/files/1/0439/2786/3464/files/31900596635.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/business_english_and_communication_by_clark_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/saxodokinikafabifitirawut.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0056/files/carta_formal_al_alcalde_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/kawowuborafitalebodaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/4669/0203/files/96762041629.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/87417410330.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_off00005c80.bin
7e9043358f908256f83d314cc1b701735f1dec1614653ee397859f78ba8b6630
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C80 5552 bytes
font_01_sfnt_off00006f3b.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3B 1800 bytes
font_02_sfnt_off000077c8.bin
b10f10396806817cb8167a44f49f115940310096fc674a8d04d404eb3cd1197e
pdf-font-stream PDF embedded font (sfnt) at offset 0x77C8 9840 bytes