Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d2c434df127c74…

MALICIOUS

PDF

89.6 KB Created: 2020-11-08 03:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d74a95d64094b5d2d4f6258ab28ce20 SHA-1: 7aa67ccfc70853ffd6fbe18d5353a8e204022de6 SHA-256: a4d2c434df127c74406054e9c06688e3d3e75f18e596c090e4f8526ef04d0865
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/123?keyword=ap+euro+exam+review+study+guide+cram+packet'. Additionally, the PDF is flagged as a link farm, suggesting it's designed to distribute traffic to various external resources. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gettraff.ru/123?keyword=ap+euro+exam+review+study+guide+cram+packet
    • https://cdn-cms.f-static.net/uploads/4416493/normal_5fa4b8546bb84.pdf
    • https://daxedinojadu.weebly.com/uploads/1/3/4/5/134590150/2290456.pdf
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/9882322.pdf
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/0b7625bfcdb5.pdf
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f9a5a9867bc8.pdf
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/5014488.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lezopobigeza/book_acknowledgement_sample.pdf
    • https://pevejimo.files.wordpress.com/2020/11/tenopegavujanup.pdf
    • https://s3.amazonaws.com/remeranexe/aines_dosis_pediatricas.pdf
    • https://s3.amazonaws.com/leguvefu/a_short_history_of_neoliberalism.pdf
    • https://s3.amazonaws.com/toliwudalamem/36448421219.pdf
    • https://xozolow.files.wordpress.com/2020/11/ombres_a_la_foscor_resumen.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009ec6.bin
cfd810a5ea282119da4c1abf509a1e6bf8c77e42bfdbea3e308bbcdcc7c40f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC6 6872 bytes
font_01_sfnt_off0000b01c.bin
73ddc501a7f1ecd1129cfb6f7618ab10ad42b4c5c6e75b63eecb1b4cfd0969a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB01C 5512 bytes
font_02_sfnt_off0000c2fd.bin
b4f907b127f2c76b06cd456eeec5930a26b19a10cae331726436c3ecd86d877d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FD 31144 bytes
font_03_sfnt_off00010d43.bin
ac37422a193eb229d0cc0f45c960af9cee2cd59311c5ccc01c6792aef93c7e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 11328 bytes
font_04_sfnt_off00013405.bin
d03d3bc7aa1dc9b3ee7f2040365c2db1e3c0c7a7d0e6d8ee51344ddbcb5fc0ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13405 16312 bytes
font_05_sfnt_off0001499e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1499E 4324 bytes

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