Malicious PDF — malware analysis report

Static analysis result for SHA-256 26154c24e6b8f42a…

MALICIOUS

PDF

53.4 KB Created: 2020-07-31 11:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea15c8804d0a991158a8969c6b2f25e9 SHA-1: fd78e18c28a3e7e1f2f835bda3045f500ec25836 SHA-256: 26154c24e6b8f42a74eff9b88b9fb8539f05631347ebb2a7dcc73e7fae11b9c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body is heavily obfuscated, but the presence of the 'icarus daedalus pdf' string and the malicious redirector URL suggest a lure for users to click through to a compromised site. The PDF also hosts a large number of other PDF files on Shopify domains, indicating a potential link farm for SEO poisoning or traffic redirection.

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=icarus+daedalus+pdf
    • http://files.wesleyancollegemetz.com/uploads/1/3/0/7/130775084/df4f5f2c1.pdf
    • http://files.galateeagallery.com/uploads/1/3/2/3/132302966/wuporupi.pdf
    • http://files.estherhousecares.org/uploads/1/3/0/9/130969893/1007b56746.pdf
    • http://files.edtechrodgers.com/uploads/1/3/0/9/130969158/lulosidanatu-fomas.pdf
    • http://files.spotlightseniorservicesphoenix.com/uploads/1/3/2/7/132710797/653402.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1532/files/vusavo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wupukibasabozuxijixosi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/pokefopesokugubori.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/zofepagajobejunafike.pdf
    • https://cdn.shopify.com/s/files/1/0437/6212/2903/files/14331458331.pdf
    • https://cdn.shopify.com/s/files/1/0434/7265/0397/files/dojepilobipaju.pdf
    • https://cdn.shopify.com/s/files/1/0430/4607/6565/files/wufevudalor.pdf
    • https://cdn.shopify.com/s/files/1/0437/3702/2615/files/jepawalo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3319/7718/files/kagututexudiladavepal.pdf
    • https://cdn.shopify.com/s/files/1/0428/4756/8039/files/56127960505.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5687/files/sebonogurenidewe.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_off0000915c.bin
ab0f37674e8af32e5fd8b92e2438c5f7477aaa24d8e34353e9d3f332a9067aa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x915C 4624 bytes
font_01_sfnt_off0000a115.bin
999fd224558a6ead6f69531ec8299d77cac9e09f7879cb79a040f4d2a4a25c51
pdf-font-stream PDF embedded font (sfnt) at offset 0xA115 11760 bytes