Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd1655afe9956aa…

MALICIOUS

PDF

47.4 KB Created: 2020-08-06 14:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18bbe3ae789a98c3022a5395c2984f89 SHA-1: 3c9f571567a35bf944637c1b55a6f9002fdc07e7 SHA-256: 8dd1655afe9956aacef1b9e1b74490e99f44a7940e84c20e2647ab5e606b70f8
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The embedded URL in the document body, 'https://ttraff.cc/pify?keyword=humira+prescribing+information+pdf', is likely intended to lure the user into downloading further malicious content. The ML classifier also 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.cc/pify?keyword=humira+prescribing+information+pdf
    • http://files.westernmontanafurcenter.com/uploads/1/3/0/7/130740257/c0e8689a946d34e.pdf
    • http://files.iainjackphotography.co.uk/uploads/1/3/2/3/132303083/kufawetiwidu.pdf
    • http://files.tzaddi.net/uploads/1/3/0/7/130775970/jewozerigapu-mabekoziku-dukug.pdf
    • http://files.svitakwood.com/uploads/1/3/1/4/131407890/eecba7.pdf
    • http://files.hound47.net/uploads/1/3/0/9/130969580/zapokenapusu_woligagilononu_notaja.pdf
    • http://files.iainjackphotography.co.uk/uploads/1/3/2/3/132303
    • https://cdn.shopify.com/s/files/1/0437/4642/7034/files/53603733238.pdf
    • https://cdn.shopify.com/s/files/1/0430/5013/9801/files/sozozowujatizumofuxawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9746/4731/files/depopuzutazupiwod.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/72993985485.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1594/files/zelawenajivavusexexoki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17418425376.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/filoxoraruzuxeva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31184917419.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/17002829255.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zumimulapowekulusevenire.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_off00007a4b.bin
5487e392cd9fff90cd44c0f31f6e6a7f8002d33cc40d32db11748449470e1570
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4B 5544 bytes
font_01_sfnt_off00008d04.bin
bca4004e75e4a52ba13059c79cb295ef3195232f056733457af3b8e079b968a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D04 10400 bytes