Malicious PDF — malware analysis report

Static analysis result for SHA-256 62dd6fede80a4271…

MALICIOUS

PDF

42.5 KB Created: 2020-08-07 22:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ca037d25211d1ed086d61e9677b107e SHA-1: 7aa0508b0a65b0d528dfeaaa7eec04221d49e765 SHA-256: 62dd6fede80a4271d1deec5e9e6754dad6aefdadb6bceac41c3cbb1c2e7f1bd3
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'cfa level 2 books pdf'. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a phishing attempt via a malicious attachment, leading to a 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://ttraff.cc/pify?keyword=cfa+level+2+books+pdf
    • http://files.peoriaarea.com/uploads/1/3/2/6/132696018/68ea4.pdf
    • http://files.infraredcreations.com/uploads/1/3/1/3/131382841/tukufofe_vakojexovapa_jifajadu_sisifetebofixos.pdf
    • http://tiwevab.thisstuffrocks.net/uploads/1/3/1/4/131406717/tiwumo-buzobi-xolenexudemo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/miboravenupufewama.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/30795512813.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7175/files/niworamolivo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5095/7974/files/download_soal_usbn_biologi_sma.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdf
    • https://cdn.shopify.com/s/files/1/0431/6597/4690/files/aditya_birla_network_hospital_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/adding_fractions_like_denominators_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/70620961011.pdf
    • https://cdn.shopify.com/s/files/1/0432/1371/7662/files/7268057193.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7884/files/verajifawidenorojog.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/tal_dorei_campaign_guide_free_download.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_off00006778.bin
bfb316335b1b7a24fb8c8a9ff92f35c4ac08a0978682d5d5bba9b1081a9173e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6778 5240 bytes
font_01_sfnt_off00007963.bin
de9891d1cab577eb423a498c4d0b7428e945498254c714116f3706ba0eabeadb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7963 10532 bytes