Malicious PDF — malware analysis report

Static analysis result for SHA-256 d693edf7c6565095…

MALICIOUS

PDF

49.0 KB Created: 2020-08-10 17:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d296a535c9d1a101e1d5689b5a27e8cb SHA-1: df0baf1ca905e49cbb9bf941b643abfd63c3b509 SHA-256: d693edf7c65650959dc0065bb3769e9eb569a6fe50f8385466cdd6b05a6057c9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm hosted on Shopify. One of these URLs, 'https://ttraff.cc/pify?keyword=sound+card+oscilloscope+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=sound+card+oscilloscope+pdf
    • http://files.amydawsbodywork.com/uploads/1/3/0/7/130775953/sadureviro.pdf
    • http://files.kcomemphis.org/uploads/1/3/1/4/131453543/rawopepijow.pdf
    • http://files.venicelcp.org/uploads/1/3/1/3/131380397/886633.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/kukebixunovazumafoxit.pdf
    • https://cdn.shopify.com/s/files/1/0440/1656/6422/files/rabavuveretexes.pdf
    • https://cdn.shopify.com/s/files/1/0434/5059/7528/files/how_to_eject_cd_from_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5023/files/96083181749.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0432/7948/3048/files/85781705537.pdf
    • https://cdn.shopify.com/s/files/1/0434/4286/4294/files/xomasuxefivof.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2904/files/zolamujapebedu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/tepemalug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/ramanatevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6772/7269/files/mahindra_tractor_parts_price_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/87388936351.pdf
    • https://cdn.shopify.com/s/files/1/0436/8180/8549/files/naturia_deck_duel_links.pdf
    • https://cdn.shopify.com/s/files/1/0434/0406/6967/files/63211077632.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_off0000813d.bin
a80433b1447d5c1768ef5dcae41df32cde66bb765796b1ee0471aab8974ab005		 pdf-font-stream PDF embedded font (sfnt) at offset 0x813D 5252 bytes
font_01_sfnt_off00009324.bin
e6892384fe382cfc73a2f4e4c7364fc98381dde0d1a7d1d85e81f8871446ab91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9324 10620 bytes

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