Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd19b504c0265ab9…

MALICIOUS

PDF

41.2 KB Created: 2020-07-31 10:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12b23fd6597f5a477147648889f9bd47 SHA-1: a3d5dde896881f17a70280a5b57b1450d0053027 SHA-256: fd19b504c0265ab988def3731e6e918a37f8f33d67a00972488b10f84c930b34
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with multiple links pointing to Shopify-hosted PDFs. One of these links, 'https://ttraff.cc/pify?keyword=bachianinha+partitura+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious infrastructure, likely for phishing or malware distribution.

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.cc/pify?keyword=bachianinha+partitura+pdf
    • http://files.psychsisters.com/uploads/1/3/1/3/131380689/rokagubogosa.pdf
    • http://files.iridescentideas.com/uploads/1/3/0/7/130776206/vunovapux.pdf
    • http://files.zombietoes.com/uploads/1/3/2/8/132815054/tamivarawarikobadege.pdf
    • http://files.northwestiowatournaments.com/uploads/1/3/1/1/131164002/3294463.pdf
    • http://files.larnemusicfestival.com/uploads/1/3/1/0/131070560/e7349d8d7cb4.pdf
    • https://cdn.shopify.com/s/files/1/0431/7878/6965/files/dijadi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1651/files/78159311808.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/7882823254.pdf
    • https://cdn.shopify.com/s/files/1/0432/7335/5424/files/lamegijunifixifajobamuse.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29942388251.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/64488459249.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/51369667421.pdf
    • https://cdn.shopify.com/s/files/1/0433/1087/4777/files/69231833047.pdf
    • https://cdn.shopify.com/s/files/1/0432/7279/8373/files/29812740175.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/7895420454.pdf
    • https://cdn.shopify.com/s/files/1/0430/2723/4969/files/sabatukapamavuxute.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_off000064a9.bin
71c1226c63353dbdd68987740b4be3aa741a3f4fddbee3d7ecf74d90e5865510
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A9 4736 bytes
font_01_sfnt_off000074a5.bin
281670747bcd681b0f5479ce0505d69f92477eb56819b27c22873729f740e5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x74A5 10328 bytes