Malicious PDF — malware analysis report

Static analysis result for SHA-256 6486c0c6d291f16d…

MALICIOUS

PDF

37.1 KB Created: 2020-08-02 02:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fe7d301ed530997af3d4a3c58baf7b4 SHA-1: 6e6c08b31571ca5a1ca6d770d316b0451a3b0a11 SHA-256: 6486c0c6d291f16da052f13e5dc6be9f359673914020ce12f4814c802b7ae4ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, many pointing to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One URL, 'https://ttraff.cc/pify?keyword=abella+danger+kelsi+monroe', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector and the sheer volume of links are strong indicators of malicious intent.

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=abella+danger+kelsi+monroe
    • http://files.joyadele.com/uploads/1/3/2/7/132710784/6401176.pdf
    • http://files.michaelhaggins.com/uploads/1/3/0/9/130969175/nobeginejubawe.pdf
    • http://files.bytheslicegourmetdesserts.com/uploads/1/3/1/6/131606502/8174390.pdf
    • http://files.mycoachisabelle.com/uploads/1/3/1/8/131872269/f866bdaf361cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/fevivubopuwep.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3733/files/gonoz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5534/files/fologalojatuxibalilig.pdf
    • https://cdn.shopify.com/s/files/1/0435/9438/3522/files/24471975890.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/7863881010.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/96699119515.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3471/files/2427968260.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/xavegabubaduwix.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/vivom.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/juvaroja.pdf
    • https://cdn.shopify.com/s/files/1/0431/8363/6644/files/xuzesurokinesoxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/9123/7791/files/27251020668.pdf
    • https://cdn.shopify.com/s/files/1/0430/0800/0163/files/tamep.pdf
    • https://cdn.shopify.com/s/files/1/0434/2002/4989/files/fogirunoviwajemufonotoj.pdf
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/53623847247.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_off00005262.bin
fa588786068297d42046b1d5a30cdb96863971633edae57caa6b2512e874872e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5262 5336 bytes
font_01_sfnt_off00006470.bin
76ad429435fc2a5d9ba65a884a7301b2e3ae56dc8717e90dac8abaf5713ed0d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6470 10328 bytes

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