Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7092c17f6d3ddfd…

MALICIOUS

PDF

42.7 KB Created: 2020-08-23 07:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1393b6709f985c8fd26353f1568d719b SHA-1: cd15210055295c35b512b05c28926e012caaf36d SHA-256: e7092c17f6d3ddfd5ce73fa01501b7dbad9f6f159e528328a1e02f4d19f4f010
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.cc'. The document body, though heavily obfuscated, contains text suggesting it is a PDF related to 'reported speech exercises', likely a lure. The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to malicious infrastructure, potentially for further exploitation or phishing.

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=reported+speech+exercises+b2+pdf
    • http://vugof.bizcoachgurus.com/uploads/1/3/0/9/130969445/wurepamerulobe.pdf
    • https://cdn.shopify.com/s/files/1/0454/2182/2120/files/english_speaking_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/5865/1545/files/56113979336.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3301/files/gekusavi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5799/4138/files/giwabajizuwaxade.pdf
    • https://cdn.shopify.com/s/files/1/0432/7545/2569/files/financial_reporting_ca_final_study_material.pdf
    • https://cdn.shopify.com/s/files/1/0432/6565/4939/files/zitazuxezesikofokama.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/xadinudazokojikaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/dedejetidetikepabedobuzi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5882/1285/files/captopril_mechanism_of_action.pdf
    • https://cdn.shopify.com/s/files/1/0437/4455/9258/files/29595004539.pdf
    • https://cdn.shopify.com/s/files/1/0430/6373/8529/files/anexar_ao_word.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005528.bin
195b5e0eb4630a332836d7f907048dc22bccf9c820d4af4ba2a50b34ee43eeac
pdf-font-stream PDF embedded font (sfnt) at offset 0x5528 5348 bytes
font_01_sfnt_off00006766.bin
013401a7a810535c484dd5b8471c7917d35a626a399aa570a537b2542b61a859
pdf-font-stream PDF embedded font (sfnt) at offset 0x6766 9796 bytes
font_02_sfnt_off00008938.bin
3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x8938 16096 bytes