Malicious PDF — malware analysis report

Static analysis result for SHA-256 99aba60c691f43a2…

MALICIOUS

PDF

50.1 KB Created: 2020-08-07 02:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4d3d9c361b977e4c2c5453c247cb45e SHA-1: ee97c8f418b260139e4f128b39f5a8a2f1bd4c20 SHA-256: 99aba60c691f43a2aa79a83e750b59b3b96156a4dba53af56a3a855ecd2ff86f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=appendicitis+infiltrat+pdf'. The document body text, though heavily obfuscated, appears to be a lure related to 'appendicitis infiltrat pdf'. The presence of a link farm and a malicious redirector strongly suggests a phishing or malware distribution attempt.

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=appendicitis+infiltrat+pdf
    • http://files.wildthymeflowers.ca/uploads/1/3/1/3/131383483/temidoluseze_jerig_mujijedod_pilon.pdf
    • http://files.idontknowwhatimdoing.org/uploads/1/3/1/3/131379803/3114545.pdf
    • http://files.dumperparts.co.uk/uploads/1/3/0/7/130776529/tilatenegowefe_sujab.pdf
    • http://files.tsapconference.com/uploads/1/3/0/7/130738933/8706118.pdf
    • https://cdn.shopify.com/s/files/1/0429/5750/4668/files/34392124480.pdf
    • https://cdn.shopify.com/s/files/1/0428/9075/6259/files/nesogomakivitenexu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1854/1480/files/cannibals_and_kings.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/lisazasujolewonamoje.pdf
    • https://cdn.shopify.com/s/files/1/0447/4263/9765/files/weefim_assessment_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/81772424035.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/fapesogokilipova.pdf
    • https://cdn.shopify.com/s/files/1/0435/1167/7083/files/primary_prevention_of_cardiovascular_disease.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/68770546555.pdf
    • https://cdn.shopify.com/s/files/1/0434/0842/5123/files/30749636823.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8298/files/dufagiriledimivikotusa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6006/files/xubusizojoxezajubemidun.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084b6.bin
4009e3cb0b5b23da06769ce934bae7bddc61f0c35286fc5061ebaa64216307d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x84B6 5140 bytes
font_01_sfnt_off00009646.bin
541d753ef782c87dcfd522a5b54ce673250f48db1341817b710474ec06d9ccfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x9646 11496 bytes