Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d553ce5c4472b7…

MALICIOUS

PDF

35.8 KB Created: 2020-08-18 23:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60319ff99be7c37ee942ac6fc1022245 SHA-1: 7e9f9982d1dc1d20d196e4a387d9dabc93607faf SHA-256: 88d553ce5c4472b7f7fddbe84ae9975c5c209c028c015685ad7d5dfc8948cee5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=caetano+galindo+pdf', which is flagged as a malicious redirector. The presence of numerous links suggests an attempt to lure users to external sites, potentially for SEO spam or phishing.

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=caetano+galindo+pdf
    • http://files.hmbw.co.uk/uploads/1/3/1/4/131453682/3795514dd2fb.pdf
    • http://files.wiffrudd.com/uploads/1/3/0/8/130813698/d99e7.pdf
    • http://files.sevenstarsamerica.org/uploads/1/3/1/8/131871816/bukezo_rinifigimetabi_tuvovetosiv_kutimufufeluk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1438/8888/files/kiterepidopiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0177/4233/files/78710394132.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/20708804872.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/sarepapikejefaretu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/dixiziwofima.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/jikufamubupader.pdf
    • https://cdn.shopify.com/s/files/1/0455/4991/2229/files/somuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/toro_recycler_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3263/files/nopetenofoxi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0642/5248/files/gusogovusu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/38158325100.pdf
    • https://cdn.shopify.com/s/files/1/0433/3492/6495/files/japipurigef.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/146866880.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ea6.bin
dd84d61c5eeb86addaabd805acbdd895aec4e5667f84b048ced9ea36e2ea74f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA6 4840 bytes
font_01_sfnt_off00005f39.bin
3a9a459059aa33248002960953f4bc727a46f89a070095af8fcabd0df7e7c383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F39 10696 bytes

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