Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2b68d1ada1368e…

MALICIOUS

PDF

44.7 KB Created: 2020-08-31 15:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e21c35578911dfc74d9651f90eb03ca6 SHA-1: 50650dd60f141406b78308b0e7bb7c163e8af124 SHA-256: 6b2b68d1ada1368eb76118fc02387246086738a37ba10b9b4903a7ea377bf3b1
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that is part of a link farm designed to distribute malicious content.

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=class+12th+biology+book
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/078c79_1819f077bba14be4a58259e473eb620b.pdf
    • https://static.usrfiles.com/ugd/04c368_ca4cc623ed064eb0bde5ba50a4bb6196.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd78d30831c44b54afee094af1d5ca48.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0816/files/38745055858.pdf
    • https://cdn.shopify.com/s/files/1/0430/8202/3061/files/nupujawe.pdf
    • https://cdn.shopify.com/s/files/1/0436/5336/5910/files/57516129333.pdf
    • https://cdn.shopify.com/s/files/1/0438/4640/2198/files/jugekixipazipavupuveza.pdf
    • https://cdn.shopify.com/s/files/1/0439/1901/6104/files/kinds_of_sentences_worksheet_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/riropavurezowodekilumajup.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7253/files/xupifapimizifuxafo.pdf
    • https://static.usrfiles.com/ugd/136d07_c8406a634cb44f4c80c081f05ab420a2.pdf
    • https://static.usrfiles.com/ugd/93971e_96a23f75b3e84c5eb25d8937a521460a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4b78f0c91ff4000a4e5cf4d52f44875.pdf
    • https://static.usrfiles.com/ugd/40512e_bae376c61eeb4824aaac6307cc804974.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_off00006311.bin
9b50ce0b2c1628a03dbd6dd78d07dc56b58c0d3aaba6eeceb6a1556e2f8a784a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6311 4928 bytes
font_01_sfnt_off000073ec.bin
71d2eaee9a204f46e32b19e241a41198fa715f055e7e0025538fa81c13cb4f5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x73EC 10660 bytes
font_02_sfnt_off00009807.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9807 4324 bytes