Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0fd84f2c000386…

MALICIOUS

PDF

40.1 KB Created: 2020-08-17 01:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3fef966f0df1e2f1c37b910f1c9bef4 SHA-1: 85bb5125de2c429d4a606263414b71889dabf6dc SHA-256: 7a0fd84f2c0003868b4a0f668a8e6cbfa8d6f1f0f1869f5715516a2439f794b8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF files, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards a phishing or redirection attack.

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=wallpaper++hd+for+mobile+3d
    • http://files.number1hair.co.uk/uploads/1/3/2/7/132740352/duwesemi.pdf
    • http://joxijomoj.davidsblakeslee.net/uploads/1/3/0/7/130776819/kevaditupuwiga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/budget_2020_in_marathi_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35035436777.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7873/files/48531074347.pdf
    • https://cdn.shopify.com/s/files/1/0437/7565/6094/files/69606261367.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/fimujo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/62284163465.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/navy_brag_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/3004/4062/files/gokudebimegapiro.pdf
    • https://cdn.shopify.com/s/files/1/0429/5278/6074/files/gadejikaguteka.pdf
    • https://cdn.shopify.com/s/files/1/0432/9350/7739/files/xejusarobaxisirom.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/goguzaziwifuko.pdf
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/7720775134.pdf
    • https://cdn.shopify.com/s/files/1/0431/0650/0769/files/personality_adjectives_exercises_elementary.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_off00005ed4.bin
399f610d5a70d669a760284881166de716b87fcc1b1c5843516db51d055b0fa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED4 5420 bytes
font_01_sfnt_off00007132.bin
bde55e9b7abedcc2c36fe1cc46b73c85250e058924ab866f88344e3f7dfca4f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7132 10112 bytes