Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0fa74ebef5e71a…

MALICIOUS

PDF

36.0 KB Created: 2020-08-14 21:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5cfebe70694fb7707eb2c00a595c9a3 SHA-1: a82cf422bf21a78dff335610f5296ac95a2627db SHA-256: 6f0fa74ebef5e71a76d05deee885469ab777543bf9250d4ad3d38d49e8061fa3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text fragments suggesting it is a 'revision guide' and includes the malicious URL. This indicates a phishing attempt to redirect users to malicious infrastructure.

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.com/pify?keyword=an+inspector+calls+revision+guide+online
    • http://files.stalbridgelibrary.org/uploads/1/3/0/7/130740142/sumenilebi.pdf
    • http://files.henhouseart.co.uk/uploads/1/3/1/4/131438323/e9a7b39d6f.pdf
    • http://files.mazarchery.com/uploads/1/3/2/8/132815737/kagibipijitigawas.pdf
    • http://files.melindacochraneauthor.com/uploads/1/3/0/8/130874683/8ff08058f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/8301/7895/files/brother_of_the_year_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/530262831.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/azotobacter_sp.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21800621301.pdf
    • https://cdn.shopify.com/s/files/1/0432/5939/6254/files/jimigutowufaxefar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30617095305.pdf
    • https://cdn.shopify.com/s/files/1/0434/8333/2772/files/60893539214.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3505/files/jukefetevagopuwewesifodek.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/77145217689.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/define_the_concept_of_administration.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/sikufumanane.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/gimuzeximedofo.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_off00004f04.bin
b3e3b7d8a28b6078f84a44a2f27adf130f3f7616c57ce916e7a43b63ae1a908e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F04 5288 bytes
font_01_sfnt_off00006108.bin
b01a18abce78a1bb5b3ea957cff65399ff925501b260de7f80e7398e0e79ed2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6108 10080 bytes