Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ac161143bd751e…

MALICIOUS

PDF

61.9 KB Created: 2020-08-21 23:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65c6fe1b3325f305e6dc755b334b32de SHA-1: 642719339c18d7e952125a82f8ad768f2653672a SHA-256: 18ac161143bd751e29376d174f2afb06a02d41c077901a1803ce85361e8a959b
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/pify?keyword=stranger+things+season+2+episode+guide+spoilers, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain the same lure text and URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the malicious nature of the link, and PDF_SEO_LINK_FARM indicates a large number of similar links were present, suggesting a campaign to distribute malicious content.

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.cc/pify?keyword=stranger+things+season+2+episode+guide+spoilers
    • http://files.mushini.net/uploads/1/3/0/7/130739379/416571.pdf
    • http://files.sunsetparkcarservice.com/uploads/1/3/0/8/130874369/9783279.pdf
    • http://files.dekalbtennessee.com/uploads/1/3/1/1/131164236/penivumiruguvemeniw.pdf
    • http://files.tranquilpalmsmaui.com/uploads/1/3/0/7/130739274/8604543.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4876/2529/files/bufaseritexitenovu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/7435358175.pdf
    • https://cdn.shopify.com/s/files/1/0438/1910/6466/files/ashrae_handbook_hvac_applications_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/24078043520.pdf
    • https://cdn.shopify.com/s/files/1/0434/1284/8790/files/duzomut.pdf
    • https://cdn.shopify.com/s/files/1/0429/1805/1996/files/lipid_profile_test.pdf
    • https://cdn.shopify.com/s/files/1/0450/6550/2872/files/bending_stress_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/historia_de_las_brujas.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/benzoato_de_sodio_usos.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/88464604693.pdf
    • https://cdn.shopify.com/s/files/1/0431/4493/7628/files/dufikaponolelegaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/abundant_life_bible_study.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/wagonivebubabemaje.pdf
    • https://cdn.shopify.com/s/files/1/0455/4991/2229/files/donepezil_davis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b452.bin
c1af86c59ea6d131fd33f18d3e2fa8d0b02861cc51ff5b988c4cd2956d6a1924		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB452 5456 bytes
font_01_sfnt_off0000c6ca.bin
bcf3bd84835a89e780d0a6f216b2905d047c6730fe4566d54de114458fd50cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CA 10320 bytes

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