Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a903fd621045a95…

MALICIOUS

PDF

43.6 KB Created: 2020-08-20 01:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e03670a32277c800d26870851073cc8 SHA-1: 599587dbcb782e121cc25cb1950446609a1f565b SHA-256: 4a903fd621045a957f7b15956b879e574dc09168db7d4f1451a40ef271b1bb78
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a known malicious domain, ttraff.com, disguised as a tax form. This indicates a phishing or scam attempt. The PDF also hosts a large number of links to other PDFs, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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=qualified+business+income+tax+form
    • http://nekabu.harmonyhypnosiscenter.com/uploads/1/3/1/0/131070627/limaxomibox_nasixinosadex.pdf
    • http://zowejut.cpanta.com/uploads/1/3/1/3/131398134/gorugego-zokarokubus-fomoliwopinuf-wolexidujaz.pdf
    • http://fuzuvim.doityourselfdocumentaries.com/uploads/1/3/1/4/131453832/8097349.pdf
    • http://files.bayleerose.com/uploads/1/3/0/7/130739457/4933030.pdf
    • http://fuzezun.fizzgram.com/uploads/1/3/1/4/131406947/vonuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/2630/9543/files/cain_software_for_hacking_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/7784/3609/files/funza_lushaka_bursary_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/lokibikepuvojimefowop.pdf
    • https://cdn.shopify.com/s/files/1/0435/1826/3448/files/sample_action_research_proposal_in_ethiopia.pdf
    • https://cdn.shopify.com/s/files/1/0433/0255/1716/files/how_to_speak_fluent_english_without_hesitation.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/event_ticket_html_template_evey.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3967/files/waterloo_battlefield_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/1258/5634/files/kibafisu.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_off00006a71.bin
be4113d51b397d45f76d809d3dd5efabaf7ad9f79e803a5eb0f35856dadb25c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A71 5436 bytes
font_01_sfnt_off00007cd4.bin
8f9de078c98caeb4740e8439779eae27af65b8723a1fc5395c3621b757740251
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD4 10852 bytes