Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0a56eacc11941a…

MALICIOUS

PDF

44.9 KB Created: 2020-08-04 12:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da2cf085491679287a1241165da6006d SHA-1: 25dc796dbd2c0f4cc19a12b396a07141ebd956e2 SHA-256: cb0a56eacc11941a6cc7bb7ae8af18457276d175b09450deac1184ec8c8ad97a
128 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=ejercicios+just+already+yet+pdf', which is also flagged as a malicious redirector. The presence of a 'download button' heuristic further suggests a deceptive workflow. The primary goal appears to be redirecting the user to malicious infrastructure.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ejercicios+just+already+yet+pdf
    • http://files.konajoanna.com/uploads/1/3/2/8/132816096/c9b5668.pdf
    • http://files.schrockeducates.us/uploads/1/3/0/8/130874582/a3c5cd3.pdf
    • http://files.stfrancisrutherfordton.org/uploads/1/3/1/4/131453588/jeruxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/8741/9806/files/27929375589.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8784/files/lebiviranuwipodewowijap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24413790208.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4673/files/xubikufuwuwofugur.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/reduzuza.pdf
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/vudiwubebuti.pdf
    • https://cdn.shopify.com/s/files/1/0431/0905/6668/files/5967349813.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9648/files/notexi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1427/3698/files/virabusumaxozameruna.pdf
    • https://cdn.shopify.com/s/files/1/0434/9050/8960/files/gapafapobuwoseb.pdf
    • https://cdn.shopify.com/s/files/1/0440/4091/3046/files/xupexonufaforivoguxuz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c1d.bin
1763931d75a11028f401e1ca7fb06dca457e6f04ca9999f77b0efbef26502bcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1D 5284 bytes
font_01_sfnt_off00006e34.bin
7fcc542e192caaced57b32abc92866246b098b8dc3525f6738aef8688e36ec62
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E34 10120 bytes
font_02_sfnt_off00009120.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9120 16312 bytes