Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de5ed18dd2a26fb…

MALICIOUS

PDF

44.2 KB Created: 2020-08-18 20:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bba68f4c6ee4f47ea0ce8c2d5eb50029 SHA-1: dda36b5c4426dc74227b9235dcb6036101df070e SHA-256: 5de5ed18dd2a26fb0e7bfc9d5e937d74941d0d9f6dff8f834f38ed70b0251e7b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to potentially malicious or redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.com/pify?keyword=anaphylaxis+pediatric+guidelines+%25E0%25B9%2584%25E0%25B8%2597%25E0%25B8%25A2 as a malicious redirector. The PDF_SEO_LINK_FARM heuristic indicates a mass external PDF link farm, suggesting an attempt to drive traffic to various sites, some of which are benign but others are unknown or 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.com/pify?keyword=anaphylaxis+pediatric+guidelines+%25E0%25B9%2584%25E0%25B8%2597%25E0%25B8%25A2
    • http://tezex.thornhillactingstudio.com/uploads/1/3/0/8/130873995/fawurejajovanusotite.pdf
    • http://files.crichardking.com/uploads/1/3/1/4/131452858/rizositese_refuxoxurox_tamefadire_bixulekafu.pdf
    • http://numuxub.chriscosmostattoocyprus.com/uploads/1/3/1/4/131437069/pesare.pdf
    • http://files.tassaace01.com/uploads/1/3/2/7/132740930/vamiwibogi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0428/4583/1324/files/watojalumido.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7428/files/cbse_class_12_syllabus_2020_18.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/hunger_games_3_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3250/files/57659761227.pdf
    • https://cdn.shopify.com/s/files/1/0434/8257/9110/files/pajivovasepotaji.pdf
    • https://cdn.shopify.com/s/files/1/0432/2381/0211/files/mamiwuferukuxikavibidi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3215/files/animal_cell_parts_and_their_functions.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/zijokovevidir.pdf
    • https://cdn.shopify.com/s/files/1/0432/0401/8336/files/dekaxekewizemusazok.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/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059d6.bin
f740e799db044775b913a58c0814276e4ec4d5d907e786daa018c63362d949ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59D6 5492 bytes
font_01_sfnt_off00006c71.bin
719a7819176e2d2fcba9dcc7371bc7de13d32aea0dd65be061c78de1271d2243		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C71 6228 bytes
font_02_sfnt_off00007ca1.bin
89df438d54863a4a0889e49421312c12b4b0bacb667721a710c1bcca22eea1de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA1 10788 bytes

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