Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b04ca7244f917e…

MALICIOUS

PDF

44.3 KB Created: 2020-08-25 05:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7857d80d2eda828a5ec99edbf657ad2 SHA-1: 0e5c28ea1f494d5df14c0b017cf86d6ea322f745 SHA-256: 77b04ca7244f917efc3687d6fd38305c0b0ebe9df8c44f8ce572b90dcb9c11f4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=embed+javascript+in+html+form'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful 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=embed+javascript+in+html+form
    • http://files.planoeastbasketball.net/uploads/1/3/0/9/130969151/kinekubozul_vimoxolabima_poritapononefif_bigasinonid.pdf
    • http://jipetowum.richardheidenfeldermd.com/uploads/1/3/1/3/131384714/855b2.pdf
    • http://gineru.rivendellmeadows.com/uploads/1/3/1/1/131163635/873ec2dfe.pdf
    • http://files.hotcrateshop.com/uploads/1/3/2/8/132815298/tazujuvasu.pdf
    • http://files.followingthejoy.com/uploads/1/3/0/9/130969424/panavufabemena_kabeburo_vaxuki_mizuvaxoxon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/30998885240.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/87551347273.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4992/files/timaxeradibom.pdf
    • https://cdn.shopify.com/s/files/1/0435/5837/1480/files/83965032869.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/buddha_hoga_tera_baap_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0435/6816/9121/files/albuterol_ipratropium_davis.pdf
    • https://cdn.shopify.com/s/files/1/0440/7309/1222/files/2656699954.pdf
    • https://cdn.shopify.com/s/files/1/0437/9449/7698/files/aura_carlos_fuentes_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/waguvixonaduxat.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069df.bin
f946eea58effb93903df9df57b34ac88a7b4421d6d611be4b2740da0efd678a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x69DF 5628 bytes
font_01_sfnt_off00007cdb.bin
c3c9abfd010f1645ddbda0406670dee18bdce7ab31404f06226c1992e6b8deed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDB 12204 bytes