Malicious PDF — malware analysis report

Static analysis result for SHA-256 9839bb7cc59d0feb…

MALICIOUS

PDF

76.0 KB Created: 2020-08-22 02:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 501d5b6d3966b58cf90690608d56a0e3 SHA-1: 81e7ae69cf38c60d463c7f66c9839208332c77bb SHA-256: 9839bb7cc59d0feb19bb24e858baa61eac71348b630789ab0200d2ec24e0861a
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDFs hosted on Shopify. One critical heuristic indicates that the document links to a known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=vector+addition+worksheet+linfield+summer+answers', suggesting a lure related to academic content to entice users to click the malicious link. The presence of numerous links and the redirection to a malicious domain indicate a link farm or phishing attempt.

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=vector+addition+worksheet+linfield+summer+answers
    • http://files.firstsaturdaypdx.com/uploads/1/3/1/3/131397950/xuwetu.pdf
    • http://sowopifog.ananda-devi.com/uploads/1/3/0/8/130874012/vuniwuniguzuga_wirilujala_volasax_jejewodiwusu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8249/files/12790943360.pdf
    • https://cdn.shopify.com/s/files/1/0437/1097/2058/files/bahubali_2_all_video_song_tinyjuke.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5739/files/lagezir.pdf
    • https://cdn.shopify.com/s/files/1/0451/9283/9317/files/polarized_light_microscopy.pdf
    • https://cdn.shopify.com/s/files/1/0437/8053/8529/files/50932566904.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/lagibiduxomuvuguperox.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3885/files/best_android_phone_under_5000_rs.pdf
    • https://cdn.shopify.com/s/files/1/0432/4694/4416/files/sibimelanazaselowipega.pdf
    • https://cdn.shopify.com/s/files/1/0431/6663/0037/files/14304875115.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/smoke_devil_dungeon.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_off0000edb3.bin
a2bc401d728a13fbbc951618d290cd1dd8b547dd609133bc7129f8309ba6d150		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 5380 bytes
font_01_sfnt_off0000ffe7.bin
4d761c65cfd0909926b3a12a02a610f85f6006651590726db9b860ff85f8b2c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 10352 bytes

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