Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddff255f7448888…

MALICIOUS

PDF

53.6 KB Created: 2020-11-05 22:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2104e364df1801e9a0e163276836de4e SHA-1: d42e6a490d106235a7dea6ef1426295da9136f74 SHA-256: cddff255f74488885980d30a89a7aa3f7dfcf636b66c64125241b0847c42d2e5
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominently pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'quiz answers' theme, aligning with social engineering tactics. The presence of numerous external PDF links, many benign, indicates a link farm strategy, likely to obscure the malicious redirector.

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://traffmen.ru/123?keyword=question+42+impossible+quiz+answers
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/koxaw_tedadad_sagefudulu_pavilitomovan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gozilum/love_is_a_losing_game_lyrics_traducida.pdf
    • https://s3.amazonaws.com/fosalizuzu/97629251044.pdf
    • https://uploads.strikinglycdn.com/files/4cd64e28-4ac1-4b20-a694-a96a75ca07f8/all_summer_in_a_day_questions_and_answers_englicist.pdf
    • https://s3.amazonaws.com/pazifetanegapu/beginners_spanish_books.pdf
    • https://s3.amazonaws.com/senodiw/81333538436.pdf
    • https://uploads.strikinglycdn.com/files/f7bdad6c-9088-4ed4-82dd-4d9c13d95dd8/41177575646.pdf
    • https://uploads.strikinglycdn.com/files/4fb7583d-c994-4ace-bc1d-7c6f7e6765b1/67891769997.pdf
    • https://s3.amazonaws.com/fefurorobumi/tumopebor.pdf
    • https://s3.amazonaws.com/zirojopemup/kenmore_sewing_machine_manual.pdf
    • https://s3.amazonaws.com/wonoti/46676817651.pdf
    • https://uploads.strikinglycdn.com/files/62bf75a1-0a32-4c77-a707-403b1618e815/gozejodawef.pdf
    • https://s3.amazonaws.com/ligole/18314947121.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_off0000884f.bin
c4dcc50b1e5ea9ee639fe33230fc5a869af9264c982b38cd9918728ac95d06ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x884F 5656 bytes
font_01_sfnt_off00009b94.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B94 1800 bytes
font_02_sfnt_off0000a422.bin
a69967d30a68e4124eb6a21488e41fa672eeef5ab516eae20df0d07d72025508
pdf-font-stream PDF embedded font (sfnt) at offset 0xA422 11008 bytes