Malicious PDF — malware analysis report

Static analysis result for SHA-256 08603578c3fb6144…

MALICIOUS

PDF

43.3 KB Created: 2020-08-27 21:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b2f28a954b5f26a2880485d9c81e8ea SHA-1: 3b1b1d12a99573d0c1f6ff8f65634385fad8518f SHA-256: 08603578c3fb6144b18fe699a93c69afeb820a2107794b997abb255a1d107975
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes URLs that mimic academic content or software downloads, suggesting a lure to phishing or malware distribution sites. The ML classifier also strongly indicated maliciousness.

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=sejarah+pendidikan+islam+pada+masa+abbasiyah+pdf
    • http://files.wetakeitpersonalsales.com/uploads/1/3/1/6/131606349/8462361.pdf
    • http://files.empressreadings.com/uploads/1/3/1/6/131636872/64377.pdf
    • http://files.crowandcrown.ca/uploads/1/3/1/4/131438098/galegajavi-giduxolosaben-ruxizutogozat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9765/3397/files/adobe_reader_free_download_for_windows_10_filehippo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/botubepixetebabaguvot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/metiliwetizo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7968/6549/files/avascular_necrosis_of_femoral_head_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0437/6710/3645/files/5124355993.pdf
    • https://cdn.shopify.com/s/files/1/0437/1818/1016/files/82871392469.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/cake_walk_game.pdf
    • https://doi.org/10.24090/jk.v2i2.555
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a63.bin
93fc97f601a2800737cbedd89d71d7c52e7f7574a625c863de9250a2a27e8e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A63 5764 bytes
font_01_sfnt_off00007dd5.bin
f57f94f4fdc9895eecc6dd59c0cee2c4d1fb09411aa4c8793076973680bc80ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD5 10160 bytes

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