Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19e9d65b1e14948…

MALICIOUS

PDF

40.9 KB Created: 2020-08-08 07:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69a4b1da12493bd77880b1c3b780181f SHA-1: cdc6573d8a87a2776c6af363ee901cd18222e902 SHA-256: a19e9d65b1e14948026597b92e746195b0a8e72bcc83394fc75a112ad69d5720
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a lure for an 'Ecg reading book pdf'. The primary malicious IOC is the redirector URL, which is likely used to deliver a secondary payload or lead the user to a phishing site.

Heuristics 3

  • 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.
  • 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/wb?keyword=ecg%20reading%20book%20pdf
    • http://gaduze.nmcchildrenschoir.com/uploads/1/3/0/7/130738615/wisuv_musebezusu_dafoxaturuwon.pdf
    • http://susikut.madelinesteimleart.com/uploads/1/3/1/6/131607600/lajafapijefuxa_xoligavizisi_wubuxevakalem_supibigago.pdf
    • http://files.saratogatalent.com/uploads/1/3/1/6/131606923/d58bdcd3aff4.pdf
    • http://files.popkoshop.com/uploads/1/3/2/6/132695492/janesale-mijokarezis.pdf
    • https://cdn.shopify.com/s/files/1/0432/4360/2080/files/health_and_physical_education_notes.pdf
    • https://cdn.shopify.com/s/files/1/0447/6128/4757/files/cv_maker_apk.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/pujuxivaforuxuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/99679658874.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/bowuxojuvuza.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/division_algorithm_proof.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4870/files/dd_form_149.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/nixajajela.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0917/files/dobakoruxate.pdf
    • https://cdn.shopify.com/s/files/1/0434/8733/0464/files/5286862134.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1411/files/86727449437.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/tasagaditagajipelo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/kozibiwivoxuxafa.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_off00006227.bin
dd437b4bd3f4ed3ba8f9eb99cfc636bc811f9e9fdf0c0c91fc87fd2e0dd7d290
pdf-font-stream PDF embedded font (sfnt) at offset 0x6227 5272 bytes
font_01_sfnt_off0000742c.bin
ff7d86469431f9e0ef16553adc35afbe3254bb3b83fd69684095280f1ab9f46c
pdf-font-stream PDF embedded font (sfnt) at offset 0x742C 10240 bytes