Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de53334801b2e32…

MALICIOUS

PDF

47.1 KB Created: 2020-08-13 01:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6eae56a53ffd19c5bb5385649b5d120c SHA-1: 1b556db11008b4c8d752efc45bee85eaedf49ce2 SHA-256: 5de53334801b2e3206f2a4940730b72410a049b6b5fc72787198d1c43d430e68
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, and is flagged by ML classifiers as malicious. The document body, though partially corrupted, contains text related to financial risk and a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of a 'download button' heuristic further suggests a malicious workflow.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=difference+between+systematic+risk+and+unsystematic+risk+pdf
    • http://bibilola.hcleathergoods.com/uploads/1/3/2/8/132814930/winosaxirukazu.pdf
    • http://files.mew3mew.studio/uploads/1/3/2/8/132814996/3022564.pdf
    • http://files.lusialatuconsulting.com/uploads/1/3/0/9/130969489/peserel.pdf
    • http://nogat.goyevillage.info/uploads/1/3/1/4/131482995/mopajevirod_wodolidiruleno_tudilo_kemigexon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/wunezifibetus.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/raratusuvi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/8000/files/career_exploration_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/7461/7511/files/82379619807.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3945/files/vixudinebofiruro.pdf
    • https://cdn.shopify.com/s/files/1/0427/7331/5740/files/lofumi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9122/0887/files/81806827213.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/schaum_s_3000_solved_problems_in_calculus_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3743/files/doki_doki_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0433/7562/4350/files/73025437471.pdf
    • https://cdn.shopify.com/s/files/1/0438/8257/8088/files/population_and_community_ecology.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/calendar_problems_aptitude.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_off000065b3.bin
ffbd070557e4d665dfe0883370073ebac163590f66aeda28939d2f4b8e83375d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 5668 bytes
font_01_sfnt_off000078ec.bin
e50a6357ac938cf80e6eae80581616903330efb3666c0ac9f0b9c1d2d0114ae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EC 6912 bytes
font_02_sfnt_off00008ba8.bin
44aff31af0f4a1597a53567f158427decc0269a2ba3541f67bc3f1f5c62f91aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA8 10240 bytes

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