Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff0574be4194d7a…

MALICIOUS

PDF

39.6 KB Created: 2020-08-19 01:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3f8cda8e7df92846ec58689da054fab SHA-1: 339661d2ae10cc2ff368a4f0cf80916937a28609 SHA-256: cff0574be4194d7ae0b94388a2fa0d9c491d138264065663957024a03259ed45
150 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.com). This suggests a link farm or SEO poisoning technique to distribute malicious content. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=number+line+multiplication+worksheet+pdf
    • http://files.thelookbyus.com/uploads/1/3/1/4/131453990/nedunododaso_sawakenole_buxipe_badoxepunidawi.pdf
    • http://files.streetwearformula.com/uploads/1/3/1/3/131398141/6540420.pdf
    • http://files.guildscc.org/uploads/1/3/1/0/131070212/9511837.pdf
    • http://files.covoc.ie/uploads/1/3/0/8/130874416/gowikuzim.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4373/files/combine_video_and_audio.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6269/files/guvakobumoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/42478147795.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15074065918.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/becoming_supernatural_joe_dispenza_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/fudanujixizivumatizo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/36373172881.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_off00005bd3.bin
827ecb66f62ea4d9e14f42e9a224ed346449c70209578b097d11a148ca085dac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD3 5660 bytes
font_01_sfnt_off00006ef2.bin
0c1cde3f87302f5d9e13f08a44de28ed920b2beca1b683d906ed447402ecd797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF2 10132 bytes

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