Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c3cd79bbf9e4df…

MALICIOUS

PDF

42.5 KB Created: 2020-08-09 01:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b02e868e9900f28fb769e67c0b687a5 SHA-1: a14b6278320d2c022cf686f93580ee132a61d7cf SHA-256: 42c3cd79bbf9e4df9c46e5efd37b97f99f9afdf1e451891d219afde5dca39322
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector service. The primary malicious URL is https://ttraff.cc/pify?keyword=difference+between+descriptive+and+prescriptive+grammar+pdf, which likely leads to a malicious payload. The document body, though heavily obfuscated, contains references to the topic 'Difference between descriptive and prescriptive grammar pdf', suggesting a lure to entice users to click the embedded 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=difference+between+descriptive+and+prescriptive+grammar+pdf
    • http://files.erikawharper.com/uploads/1/3/1/6/131637570/manexozitiruzesus.pdf
    • http://files.dangerforce.com/uploads/1/3/1/3/131398145/bitelovutonixun-lagufuvet.pdf
    • http://files.riveroakslearningcenter.com/uploads/1/3/2/3/132303020/5b5eba15.pdf
    • http://files.thebarktales.com/uploads/1/3/0/8/130873826/034df741d.pdf
    • https://cdn.shopify.com/s/files/1/0429/3070/0455/files/60426211091.pdf
    • https://cdn.shopify.com/s/files/1/0447/8281/3341/files/biblia_jerozolimska_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/airbrushing_and_weathering_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1594/files/motel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/levud.pdf
    • https://cdn.shopify.com/s/files/1/0431/4451/1645/files/alternative_to_plastic_bags.pdf
    • https://cdn.shopify.com/s/files/1/0440/6312/9765/files/42365080085.pdf
    • https://cdn.shopify.com/s/files/1/0431/5647/1959/files/59547652288.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/56986993118.pdf
    • https://cdn.shopify.com/s/files/1/0432/8433/2710/files/an_enthusiastic_gilled_blob.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/gikobupodatojed.pdf
    • https://cdn.shopify.com/s/files/1/0434/2670/9665/files/meat_shop_business_plan.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_off00006659.bin
34c4766f54fb6d36126f77acf7831663f260cbbc49dd1f8bf47ea417baa76428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6659 5736 bytes
font_01_sfnt_off000079ea.bin
dc34a1e65e62d3e860037fa9cb4089afa5f50f9ee307bb2628d9382ccc9c826c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EA 10564 bytes

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