Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba7239bfa2cad14…

MALICIOUS

PDF

40.6 KB Created: 2020-08-03 14:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71616e7b2b9d87cd9b4e852d460c3119 SHA-1: 44907eeee4f6a7fee2bbc51c40cbf2504f0f39a6 SHA-256: 8ba7239bfa2cad144e3b040d9111ea464ff7f7f8149d112b0f3a7967688a4631
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector at https://ttraff.cc/pify?keyword=addition+and+subtraction+of+fractions+worksheets+grade+6+pdf. The document body, though heavily obfuscated, contains references to educational content, likely a lure to encourage clicks on the malicious links.

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.cc/pify?keyword=addition+and+subtraction+of+fractions+worksheets+grade+6+pdf
    • http://files.3rdpointproductions.com/uploads/1/3/1/4/131406885/3214580.pdf
    • http://files.theprideofsouthside.com/uploads/1/3/0/7/130739393/90c92.pdf
    • http://files.spiritofexcellenceworldwide.com/uploads/1/3/1/6/131637081/bagotupem.pdf
    • https://cdn.shopify.com/s/files/1/0435/1560/9243/files/38395010435.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/37678241138.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/raleradowugixulivavawed.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5578/files/jozide.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/rurafezuduz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/45826463589.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/42654531528.pdf
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/gigepofoner.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/voxakelosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/93289630079.pdf
    • https://cdn.shopify.com/s/files/1/0430/8438/2357/files/83814097638.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_off00005f3b.bin
e6d0c491b0f3c85b3e643785da630427b49b1ebd500c62c77c4a73f2bef272ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3B 5824 bytes
font_01_sfnt_off00007320.bin
56295d498dffd9b2318068bc822f7cb29607a6fa5d5205ef47fbae9bea33a543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7320 9824 bytes

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