Malicious PDF — malware analysis report

Static analysis result for SHA-256 97560af6c78dcb76…

MALICIOUS

PDF

57.3 KB Created: 2020-08-09 01:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a58f4528dd66316b73a7d9a0d49f23dd SHA-1: a01f2ed7a7516f5cbf9774c3d15eeb0644ba2077 SHA-256: 97560af6c78dcb76f8ceb6ffb863f6e32b1a5f5a66871a1e0f21d08218cd41e4
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'ttraff.com', which is flagged as malicious. The document body, though heavily obfuscated, contains the same URL and keywords suggesting a lure for a 'centrifugal compressor handbook'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for malicious content. The ML classifier also strongly indicated maliciousness.

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=centrifugal+compressor+handbook+pdf
    • http://watex.armellesix.com/uploads/1/3/1/0/131070718/e48dc134e77.pdf
    • http://bofalemal.rebuildingself.com/uploads/1/3/0/8/130874359/nivepoko.pdf
    • http://files.freeheartclinic.com/uploads/1/3/1/6/131606261/mikigiwurez.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/xozidirixogesapenume.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/mezaponigeva.pdf
    • https://cdn.shopify.com/s/files/1/0428/5743/1199/files/peguxif.pdf
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/dopejipi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/88347584565.pdf
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/98863658495.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2753/files/dajije.pdf
    • https://cdn.shopify.com/s/files/1/0437/4550/9537/files/tinutuvozelezasejesitoxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupuxisupevijerabufogete.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/weather_sawyer_mi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/25746328424.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_off000097de.bin
cc00508865cbf1e7031ba62ce6fe1e98fb6dab3141b5c8f69460d61a4b75e581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97DE 5680 bytes
font_01_sfnt_off0000aafc.bin
e0f71f0f5cea13010c8206e4f982e2c4fce0ee5df9685fba861d54e89a499c3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAFC 14644 bytes

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