Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9b11285dabc3a0…

MALICIOUS

PDF

47.8 KB Created: 2020-08-09 02:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fff45c2a3c2ea0ab6ca359b504a9dfa7 SHA-1: fc5cc8d9a9a28573b866d6bdca42ae820767b1a7 SHA-256: ca9b11285dabc3a06edecaad3b5e904f6b899fb02a8855cc8e91c57e49775b0d
128 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=mh+cet+2020+answer+key+pdf'. This indicates the document is designed to redirect users to malicious sites under the guise of providing an answer key. No scripts were extracted, and the document body is heavily obfuscated.

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=mh+cet+2020+answer+key+pdf
    • http://files.wynning-solutions.com/uploads/1/3/1/4/131437276/d560f6db.pdf
    • http://files.bishopgumbleton.com/uploads/1/3/1/3/131379371/tokasinipegog.pdf
    • http://files.linhsiuhuang.com/uploads/1/3/1/3/131379231/pejozexam.pdf
    • http://files.doublefoxx.com/uploads/1/3/1/3/131383651/3677343.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7996/files/tf2_infinite_ammo_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/long_to_string.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5456/files/zovedoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/android_permissions_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2623/files/sarejurolu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18187133080.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/mutogomesofetuwijozo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1644/4315/files/kutogegosixesanameralane.pdf
    • https://cdn.shopify.com/s/files/1/0435/5761/7823/files/51385636994.pdf
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/44504197768.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3407/files/tabanukerazakoboripajesu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1127/4914/files/mokufoni.pdf
    • https://cdn.shopify.com/s/files/1/0430/9493/3665/files/xameviramebogugulax.pdf
    • https://cdn.shopify.com/s/files/1/0431/5411/2672/files/setenakumonanuwidi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/42524412063.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_off00006e22.bin
f645e3cca9a222508620063c94c5a2fc4336383c1648a6cdcd63e185a357787a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E22 3652 bytes
font_01_sfnt_off00007b32.bin
53b4209f1eafcf77b57f7b2da437cc8f650516b11f091f7adc8b22ad9c55e13f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B32 5748 bytes
font_02_sfnt_off00008eed.bin
64afa95b71084d048b4e5d6270c4e888d41cbe3ba7eee2b4ac220dad28eb2fe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EED 10012 bytes

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