Malicious PDF — malware analysis report

Static analysis result for SHA-256 a367256d0a0f512f…

MALICIOUS

PDF

46.4 KB Created: 2020-08-10 20:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f976e0bd0a705b1ade8125146afe78d3 SHA-1: db737b9c208d79d28e204b87c288ff24aad656ff SHA-256: a367256d0a0f512f8f901baabb1f79853f56458939fe43723651dbd71a0f020e
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is presented within the document body, disguised as a link for IELTS listening test materials, and also appears in the embedded link farm. The document also contains a low-signal heuristic for a download button lure. The primary malicious URL is https://ttraff.ru/pify?keyword=ielts+listening+actual+test+vol+2+pdf, which is likely used to redirect the user to further malicious content.

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.ru/pify?keyword=ielts+listening+actual+test+vol+2+pdf
    • http://files.redbridgebuilders.com/uploads/1/3/2/8/132814593/e8a658.pdf
    • http://files.justajourney.org/uploads/1/3/1/4/131409526/465d7247d38.pdf
    • http://files.bridgedlearning.com/uploads/1/3/1/3/131398052/musasosola.pdf
    • http://files.edmontonactorstheatre.ca/uploads/1/3/0/7/130775126/nerizawulewikubis.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/luxurubewabugelan.pdf
    • https://cdn.shopify.com/s/files/1/0434/6308/2146/files/68422549676.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/flamenco_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/mumejudedarisasexaxojax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0436/1833/6925/files/vertical_bridgman_technique.pdf
    • https://cdn.shopify.com/s/files/1/0452/0129/3461/files/kalnirnay_2020_marathi_calendar_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/2655/4781/files/nrega_scheme.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/wuwuvolodufew.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/vidizunejakevupadoxem.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_off000062f9.bin
a539666cf59317414de72fd8e1bb4c886269204853aab8b5e9aa2ea90808bedf
pdf-font-stream PDF embedded font (sfnt) at offset 0x62F9 5356 bytes
font_01_sfnt_off00007547.bin
8ce5c5b35ab7a514f2462b1c0576d51ad2f6766ef215f72641af9012941cbd31
pdf-font-stream PDF embedded font (sfnt) at offset 0x7547 9920 bytes
font_02_sfnt_off00009769.bin
467334b253c03183b8f59c8c7859f446a4d85e3bd71546e4bc7697603d08a064
pdf-font-stream PDF embedded font (sfnt) at offset 0x9769 16120 bytes