Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae66917ed81933a…

MALICIOUS

PDF

56.5 KB Created: 2020-08-06 20:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02efb96be5cacdf1173c0db2c45c6eda SHA-1: c31039b14ce56b12bdeb516a2560160162e5b6ee SHA-256: 5ae66917ed81933a193b47887b7bdd0debffc28842f81637f5060783a88980ae
202 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. One of these links, 'https://ttraff.ru/wb?keyword=marshall%20mid%20anc%20user%20manual', is flagged as a malicious redirector. The ML classifier also strongly indicates maliciousness. The presence of a 'download button' lure suggests an attempt to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.ru/wb?keyword=marshall%20mid%20anc%20user%20manual
    • http://files.nonprofitleadershipcollaborative.org/uploads/1/3/1/3/131378776/581746.pdf
    • http://files.acornspre-school.com/uploads/1/3/1/3/131384127/5997725.pdf
    • http://files.toapinrisefarm.com/uploads/1/3/0/8/130874326/719482.pdf
    • http://sojod.twyfi.org/uploads/1/3/0/9/130969772/sexat.pdf
    • http://files.minnesotacenterchorale.org/uploads/1/3/0/8/130814492/xilitukidozufe_dakesa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0440/6244/1637/files/32439967368.pdf
    • https://cdn.shopify.com/s/files/1/0436/0955/5107/files/64141771228.pdf
    • https://cdn.shopify.com/s/files/1/0434/0413/2508/files/multiplication_and_division_worksheets_for_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/50331595977.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/4152305558.pdf
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/69528436591.pdf
    • https://cdn.shopify.com/s/files/1/0448/0139/2801/files/administracion_de_empresas_unitec.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2533/files/wawebovawotevup.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3943/files/22773356203.pdf
    • https://cdn.shopify.com/s/files/1/0438/3526/1085/files/1989_chevy_silverado_owners_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0441/3833/2312/files/lajijuru.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005efa.bin
7f0db5a1e4edfb10e7f657e7fc849bc954942a2488f9d7ddeba25f34f4659b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFA 5684 bytes
font_01_sfnt_off000072d5.bin
d7676009ba1376963aab4f2fe41a26df7ce91aebc455a2fc324db9ccd76dcefa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D5 5184 bytes
font_02_sfnt_off0000844c.bin
2da83060ad210a9a1743b04a22b2cc5ebb14ba7af64fbaa5f25da2d26a1b3d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x844C 6640 bytes
font_03_sfnt_off000095ea.bin
cb03000af0a3819dd587dfb3bc41b684c67af96e3ea3225d866a2ba4796f4c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95EA 11912 bytes
font_04_sfnt_off0000bc92.bin
a858ad06ee9285ef990c8ccf5509e6bce71cae8afc7f99ba8a1dcaf33198b628		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC92 16684 bytes

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