Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa5fa61aa777f65…

MALICIOUS

PDF

44.7 KB Created: 2020-08-10 00:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b582cdb49d0900d2d6e7de4a9b67e56b SHA-1: c6669b956a9ffc620497dff7a56ef42a3350967c SHA-256: efa5fa61aa777f6533a6d93d1bc41901ac3963696e3448dc6e412140253fb3b5
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to `ttraff.com`, a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The document body, though heavily obfuscated, contains the same redirect URL, reinforcing the malicious intent. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link farm.

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=esercizi+analisi+logica+seconda+media+da+stampare+con+soluzioni+pdf
    • http://files.sterlingblackevents.com/uploads/1/3/1/4/131438539/5764711.pdf
    • http://files.chicagomovietours.com/uploads/1/3/1/8/131871902/xesowonekari_pedozurik_nexikivulosiku.pdf
    • http://files.independencepyro.com/uploads/1/3/1/4/131483009/pavubuz_taparurusotaz_datok_fotakaramijape.pdf
    • http://xurarekuf.immigrationusalawyer.com/uploads/1/3/1/0/131071243/4494182.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/44483941438.pdf
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/introduction_to_contrastive_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0435/1849/2824/files/papikorijej.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/xolafabumusirosoku.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/62309549189.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/56997866296.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/81530539649.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5589/files/bilingual_french_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/kexavelumejex.pdf
    • https://cdn.shopify.com/s/files/1/0433/5098/2821/files/24278059526.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/9659764022.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/50867713598.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_off00006c62.bin
8d4432b1a2a3af2740db5f4d95cf2b0c8c0bc5977e3296f7f23ce85277bf5c6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C62 5480 bytes
font_01_sfnt_off00007efc.bin
cc99ba6ae53138c3c36377f81aaddd99302c81b623b383ad016f1cf2827af6c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFC 10892 bytes