Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc89bd9f2095bc1…

MALICIOUS

PDF

38.6 KB Created: 2020-08-04 16:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54e5ebc15588583b1f071dd082ba3b1c SHA-1: b60e3c56990ff94e8883e7bcbed3b430d5c5122d SHA-256: 6dc89bd9f2095bc1f5ae7d4945d20502f51977a828a33b80fdb63dd335a5f3a1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to distribute malicious content or engage in SEO manipulation for malicious purposes. The presence of a malicious redirector further confirms the intent to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/pify?keyword=anganwadi+centres+revised+monthly+progress+report+form+pdf
    • http://files.ancientstoriesforesl.com/uploads/1/3/1/4/131437330/puxubirobi.pdf
    • http://files.kansasmidwives.com/uploads/1/3/0/7/130775275/3771974.pdf
    • http://files.swisskonig.net/uploads/1/3/1/0/131070151/fcfa89c6b4.pdf
    • http://files.kellimahoney.com/uploads/1/3/1/6/131606231/leripezivumu.pdf
    • http://files.forestheightsacademyofexcellence.org/uploads/1/3/1/4/131453989/23a3342ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0298/5622/files/75494544536.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9177/files/delhi_building_bye_laws.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/51913287212.pdf
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/rimabivovarakujasadomabep.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5236/files/kevegufarijimupinebo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/xerojuvokuvokalulovesek.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/33802459047.pdf
    • https://cdn.shopify.com/s/files/1/0436/9927/3896/files/koripixir.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/4217992169.pdf
    • https://cdn.shopify.com/s/files/1/0432/0962/1664/files/dda_algorithm_in_computer_graphics_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98455436519.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_off00004ad7.bin
9abcc6d61cd1971f39e3e8a4ad8a9dfad7480180fb93d40b0adc6ba56abfab52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD7 5600 bytes
font_01_sfnt_off00005dce.bin
4445c4cac091c8568ecf02d947931224e60cf771ba53defcd418232659689d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCE 9672 bytes
font_02_sfnt_off00007ee9.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE9 4324 bytes

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