Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e0cf93443b1d80…

MALICIOUS

PDF

45.6 KB Created: 2020-08-24 07:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0858b27799dde5f6a74806ae9b70ef71 SHA-1: 2aadcba9cdace5cd90e51db481e603d56dc8f4dc SHA-256: 17e0cf93443b1d80e9cf22c051c6dbd95bb9ae2859e23eedb9be5f1cf5ca2253
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure for users to click on a link, likely to download a further payload or redirect to a phishing site. 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=free+annual+3+credit+bureau+reports
    • http://zusemanag.brurosa.com/uploads/1/3/1/4/131438304/lefetudi.pdf
    • http://files.pianorentaldc.com/uploads/1/3/0/7/130776509/livudepasegodin-tatozupituwid-guvukojifaxe.pdf
    • http://zigalere.urban-anatomy.com/uploads/1/3/0/7/130738884/8906709.pdf
    • http://bogew.barcfriends.com/uploads/1/3/0/9/130969264/363dbad.pdf
    • http://files.crystalcoastmagazine.com/uploads/1/3/0/7/130776712/toxurupevav_damumumizoka_zapove_ramijowepob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/0925/9158/files/bitumen_penetration_test_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5765/files/xupakixorujo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5510/files/swing_performer_musical_theatre.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/income_tax_return_form_2020_18_acknowledgement.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/bujetanegelofolobeda.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2709/files/sazupudidarujofivabuvize.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/lekixunarafewizitejatip.pdf
    • https://cdn.shopify.com/s/files/1/0431/7052/9436/files/18836304653.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3846/files/60971083374.pdf
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/bts_guidelines_community_acquired_pneumonia.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/zemudatikoxijebiri.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_off00006724.bin
e15c1470cbd29fccd74dc6ebd33479220aec0278e91409b5f808715685e500f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6724 5208 bytes
font_01_sfnt_off000078cd.bin
970d8a65e8d8642bc90743843b6691d19ac579209114a153114d1a655b2e948b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CD 10140 bytes
font_02_sfnt_off00009b68.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B68 4324 bytes

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