Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae310788d6db4f4…

MALICIOUS

PDF

38.8 KB Created: 2020-08-29 22:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 561dd4f60c6def61e61ffc83fdc3545c SHA-1: 94d5efb6cd22ae86eec64776c28af00e5f38b03c SHA-256: 6ae310788d6db4f4ef58bd2d9decfe44e4030bab7726390934abf5e9410556cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, disguised as educational content. The primary heuristic indicates the PDF links to malicious redirector infrastructure, and the ML classifier strongly flagged it as malicious. The document body, though corrupted, contains the malicious URL and appears to be a lure for educational materials.

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.me/wix?keyword=comparison+of+adjectives+exercises+pdf+intermediate
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/53396968046.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/ap_scert_text_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3499/2025/files/manual_of_montana_vascular_plants.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c2e045a93f94478b4936269a56ed123.pdf
    • https://static.usrfiles.com/ugd/b8c837_e51e4b763c4d4ca480252d4b11fa2a4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_012eaa64d26d44bcacde788e94d234b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_4441837d69a64498a0a3ca5df2a70ac5.pdf
    • https://static.usrfiles.com/ugd/b8c837_089ce241a23b406faf4b65a44f2740d0.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1964/files/passive_and_causative_exercises_1_bachillerato.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/pmbok_5th_edition_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0434/4627/2162/files/59613814500.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4602/files/maplestory_override_training_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/75537148639.pdf
    • https://cdn.shopify.com/s/files/1/0435/4349/4815/files/ceragon_ip_10_commissioning.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cb0.bin
aa0fb940d535f58c522fccddf7873020fded83bac943887fcb5e10496e22f079		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB0 5284 bytes
font_01_sfnt_off00005e93.bin
12e2256f63894c6d1bbbcd298b091ae9aa5e80acc75b8b581e0ecee687c6830d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E93 9684 bytes
font_02_sfnt_off00007fc8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC8 4324 bytes

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