Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd33f41bd44f74c…

MALICIOUS

PDF

42.2 KB Created: 2020-08-25 12:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78b2036d912a221316e952db4225e80b SHA-1: a0eda11510f3f136047e7ee25c92e4a355d18b3d SHA-256: cfd33f41bd44f74cb92878f8fa8d57a5cf8211b88a08051e4b5fbe9758553477
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used in conjunction with a lure for a 'french english dictionary for mac free'. The document body, though heavily obfuscated, also contains this URL. The presence of a large number of external PDF links further supports the SEO link farm heuristic.

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.ru/pify?keyword=french+english+dictionary+for+mac+free
    • http://files.debratidball.com/uploads/1/3/1/8/131871698/gezisenoxijuz.pdf
    • http://namutu.meganbadger.com/uploads/1/3/1/8/131856476/4350653.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/16152263901.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2983/files/66158678558.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/marvel_future_fight_apk_data_free.pdf
    • https://cdn.shopify.com/s/files/1/0460/0214/3391/files/cabernet_sauvignon_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0432/0867/1394/files/gapugerenoweda.pdf
    • https://cdn.shopify.com/s/files/1/0438/4368/2469/files/fasexozim.pdf
    • https://cdn.shopify.com/s/files/1/0440/5267/6773/files/maradawexevog.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4103/files/anker_powercore_10000_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0441/4049/5000/files/gubumetavozexo.pdf
    • https://cdn.shopify.com/s/files/1/0440/3698/0886/files/list_of_caribbean_countries_and_capitals.pdf
    • https://cdn.shopify.com/s/files/1/0440/8449/4488/files/rojapimolidoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/83951340797.pdf
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/78538656678.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_off000064ec.bin
5040ad26cc5215927cf1a2437596620829b5536d44c58812267683f205665e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EC 5492 bytes
font_01_sfnt_off00007771.bin
f606b26aaaa71694260550c68c305fb65232ca81175d21e42202fc0badc6c6a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7771 10692 bytes

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