Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa11506dccd3b49…

MALICIOUS

PDF

52.5 KB Created: 2020-08-15 01:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03fab5e2bf82895a7b78567dc0c95eb0 SHA-1: 349a534eebb83722e17a521566647724d50b1ab1 SHA-256: 3aa11506dccd3b49c0fa81597758b5742f168ee5a5875c9edf78c96ae9ffaa41
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for 'synonyms and antonyms practice pdf'. The PDF also contains a large number of external links, many hosted on Shopify, which is flagged as a link farm. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploitation.

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=synonyms+and+antonyms+practice+pdf
    • http://files.apdisasterresilience.org/uploads/1/3/0/7/130775002/fulobufakaziw_bulexisuwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/22717139703.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6275/files/xixekunufofarapaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6645/files/bekirilimaduvezizi.pdf
    • https://cdn.shopify.com/s/files/1/0447/8582/7991/files/list_of_hand_embroidery_stitches.pdf
    • https://cdn.shopify.com/s/files/1/0429/6169/8969/files/20864166174.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9772/files/manual_catia_v5_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/ib_french_ab_initio_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0438/6678/3904/files/blending_cvc_words.pdf
    • https://cdn.shopify.com/s/files/1/0436/6322/9078/files/sufixuripigexuzanizileje.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_off00009054.bin
c138a396fffcbaa1efa57b01b07b01bb8a1df05c08ecf88289f436179d4cf540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9054 5472 bytes
font_01_sfnt_off0000a2db.bin
3271a7fc2136262940c0c6e3ce046cc1db8ea027758e1a1ce054b9ab51e30c74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2DB 10280 bytes

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