Malicious PDF — malware analysis report

Static analysis result for SHA-256 914ce5a0ed16f744…

MALICIOUS

PDF

36.3 KB Created: 2020-09-10 14:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b8eed9ee0e552ab181214825d5dfd55 SHA-1: 4798ef5173e22bf1af405e04b9351181f1235261 SHA-256: 914ce5a0ed16f744cf17e7784631d37e965837d0b610b7c9762ee10cb85454b9
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to a redirector with a "hack apk" keyword, strongly suggesting a lure for malware or phishing. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the same lure text and URL as the malicious link heuristic.

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.me/wix?keyword=angry+birds+stella+hack+apk
    • http://dadilaf.forestcitycremation.com/uploads/1/3/1/8/131856890/48dd8028fb64.pdf
    • http://files.curiouscreativecritical.com/uploads/1/3/1/6/131636946/dimuzipimadigu.pdf
    • http://mesejaja.umstu.com/uploads/1/3/1/4/131437299/tufuleluvikeguwul.pdf
    • http://fivugugu.angelaherbert-hodges.com/uploads/1/3/2/7/132740763/1775cf58f.pdf
    • http://files.childemotionregulationlab.org/uploads/1/3/1/1/131163872/3777314.pdf
    • https://static.usrfiles.com/ugd/b2ba6b_61d5357b0e25420bb2a7138c2c75d24d.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/20776519454.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/tewanerafubaxulekev.pdf
    • https://cdn.shopify.com/s/files/1/0435/7364/1379/files/67718876763.pdf
    • https://cdn.shopify.com/s/files/1/0439/5712/5278/files/costco_rose_petal_cottage_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0431/5555/4455/files/ronaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/9462/9786/files/ramesalisofosexuwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/64447768882.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0209/files/caracteristicas_de_los_alcanos.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_off00004f90.bin
7465e285657bfe1f08f00184499172b26b40148a9d3c403bc5ce446f3eec99a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F90 5632 bytes
font_01_sfnt_off000062bd.bin
42e8ab064f49d27dcc67a2569e131a6c309e75ba9dcbb49c902a57bb0d37469d
pdf-font-stream PDF embedded font (sfnt) at offset 0x62BD 9920 bytes