Malicious PDF — malware analysis report

Static analysis result for SHA-256 971a4a9cb4b5824f…

MALICIOUS

PDF

63.1 KB Created: 2020-08-31 15:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de98f18997bf548efb67e77f6aa1d67e SHA-1: 1dcb0382d322335079ba531672fccc8011f8638a SHA-256: 971a4a9cb4b5824fa7a88fff26e755dbf7236ad5705148d74048de39f68aae51
152 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 partially corrupted, includes the same URL and text suggesting a lure related to 'Bloom's taxonomy explained pdf'. This indicates the primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=bloom%2527+s+taxonomy+explained+pdf
    • https://static.usrfiles.com/ugd/b8c837_d81f833b75114566a4bd516ed14344cd.pdf
    • https://static.usrfiles.com/ugd/69b86f_d543bf58dd8348628701bced1002bcf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3fef2bdc9964125807655ed9b5e839e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b9369de28884babb502e35e5b2e1cb9.pdf
    • https://cdn.shopify.com/s/files/1/0429/5370/3580/files/18747520624.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4436/files/highest_rated_answers_on_quora.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/kinunebadijizelep.pdf
    • https://cdn.shopify.com/s/files/1/0431/3851/5098/files/bernette_340_deco_file_format.pdf
    • https://cdn.shopify.com/s/files/1/0438/3988/1373/files/53152113455.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/cuisinart_ice-_20_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5239/files/4274103528.pdf
    • https://static.usrfiles.com/ugd/47b1e8_d681b3dbdb9442e3811b245567071856.pdf
    • https://static.usrfiles.com/ugd/1b8612_5a416e1bea03470c8de7bd707935d35c.pdf
    • https://static.usrfiles.com/ugd/b5472a_168a611b113a49a9910f37a3fb2133c2.pdf
    • https://static.usrfiles.com/ugd/cc14e4_f13b21edcbda4cb7b12ccaefaeffe64f.pdf
    • https://static.usrfiles.com/ugd/5bb01c_2197487db0954cfea22887c19709988c.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_off0000a298.bin
8b2e1f727383e7aee1a78a70d8a0b8f4eaae69e32316d253a66ef4ffda085615		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA298 5132 bytes
font_01_sfnt_off0000b410.bin
d7a38dadd7b8c75287514de779a42d2eb4d7f83fd9aaca4eb60dbb19348d15d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB410 14408 bytes
font_02_sfnt_off0000e151.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 4324 bytes

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