Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed39d960f9176f0…

MALICIOUS

PDF

49.1 KB Created: 2020-08-19 17:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a5495ca400ba93d55fa2f0809d02c45 SHA-1: 029cd646d5b6635a1c2875c4b018cbd696515fb3 SHA-256: aed39d960f9176f0af981f5073c396b6bebca834f66f4be21d2d0e514d756f58
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded links, a technique often used for link farms to improve search engine ranking or to redirect users to malicious sites. One critical heuristic specifically flagged a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=chihlimbar+bijuterii+informatii'. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted PDF links, suggesting a coordinated effort to distribute malicious content.

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=chihlimbar+bijuterii+informatii
    • http://voliraf.poconohydrofarm.com/uploads/1/3/1/0/131071157/8097541.pdf
    • http://fekimop.blackandgoldguy.com/uploads/1/3/2/7/132712358/f07ae2a954bf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3418/9734/files/zutuwozir.pdf
    • https://cdn.shopify.com/s/files/1/0432/6824/3624/files/71705677751.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/25297530859.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9567/files/15396470857.pdf
    • https://cdn.shopify.com/s/files/1/0428/2528/5791/files/84661250473.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/vuwapekulutobinuluropax.pdf
    • https://cdn.shopify.com/s/files/1/0438/6521/1035/files/93389922323.pdf
    • https://cdn.shopify.com/s/files/1/0429/2172/2015/files/gojegenidijefur.pdf
    • https://cdn.shopify.com/s/files/1/0432/7312/6052/files/taxivukewutisipotujudim.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/hranin_porucha_osobnosti_a_jej_lba.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9202/files/nunezutimuvotazilinutilej.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/42865461322.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_off00007666.bin
e5b8fcc6642843849a4fa9af067f664d3fd4781cca76c741d0158ad0a2154242		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7666 4948 bytes
font_01_sfnt_off00008712.bin
b1263540de143b5718b9965135c65e736f0fb5bf47beec63836c5a2a8743b729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8712 15820 bytes

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