Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5dd345eaded2b2…

MALICIOUS

PDF

35.0 KB Created: 2020-08-19 21:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6517362f15cf1f6ef288d389914af08 SHA-1: 9aac9799dd157ef924a2dcc581730a681f82bdfa SHA-256: be5dd345eaded2b2351a2185fa719aa7102a4eb2e728d264ac97705369b7e450
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm strategy to obscure the ultimate malicious destination. The document body, though heavily obfuscated, also contains the malicious URL, reinforcing the attack pattern. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=carnivores+dinosaur+hunter+android+apk
    • http://files.thegreedycouple.com/uploads/1/3/1/3/131379894/kamuxajima.pdf
    • http://files.caperecovery.co.uk/uploads/1/3/0/7/130739704/pusako.pdf
    • http://vopib.doryclub.org/uploads/1/3/1/3/131383483/cce6de63c1b1.pdf
    • https://cdn.shopify.com/s/files/1/0437/7644/2519/files/14091836763.pdf
    • https://cdn.shopify.com/s/files/1/0431/6738/3713/files/singular_and_plural_nouns_activities.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/botumikat.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/toxazipuwuvabumupegajunaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0175/files/rolotamojotunebebebaluxaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/cognitive_ability_test_practice.pdf
    • https://cdn.shopify.com/s/files/1/0449/4350/7615/files/simple_online_store_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/91522721666.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/72832410720.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4136/files/baby_crib_sheets_target.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_off00004d9c.bin
875d3cd07a87913710ab51f2b92e2b3e00ddaae40bb3323cd7fb1ed9a172a9e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9C 5044 bytes
font_01_sfnt_off00005ebb.bin
a87492e1ec405cfc5610ef3ff95bd71e4367b813699136f38aa48325be1dca78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBB 9572 bytes

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