Malicious PDF — malware analysis report

Static analysis result for SHA-256 1666b6bcae74b827…

MALICIOUS

PDF

38.5 KB Created: 2020-09-08 19:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9e51d7cd0d0d7f527e376d53722ec20 SHA-1: 1b5f59443e1ba3d2d97102e2eef450de7f8358df SHA-256: 1666b6bcae74b8273079c09af476684c109e0169457aa43028be2683041e842d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically a redirector at 'ttraff.link' which is associated with malicious activity. The document body and embedded links suggest a lure to download an old version of the Twitter APK, likely as a pretext for delivering malware. The ML classifier strongly indicates 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.link/wix?keyword=baixar+apk+twitter+old+version
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/54dfea_0328285ecdec40f2b09026cddda2356d.pdf
    • https://static.usrfiles.com/ugd/02ccf7_0830a0375e7d422b8aacfd7c9eb5fcfd.pdf
    • https://static.usrfiles.com/ugd/d13e1f_5be5d2c03ba04edcaba0ef3cf77952c5.pdf
    • https://static.usrfiles.com/ugd/ee4a13_b5be1855426640e9aaaf0f945340d22d.pdf
    • https://static.usrfiles.com/ugd/2ddd39_2305b9f5509c4470af9145ee43ba3cb7.pdf
    • https://static.usrfiles.com/ugd/409ca8_59213a9ec4394c2591fe98f9f454dbd2.pdf
    • https://cdn.shopify.com/s/files/1/0434/2746/3324/files/19147292759.pdf
    • https://cdn.shopify.com/s/files/1/0433/9934/8389/files/ergometer_bike_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/debisofimiwukaka.pdf
    • https://cdn.shopify.com/s/files/1/0450/6284/8664/files/sokalurej.pdf
    • https://cdn.shopify.com/s/files/1/0433/4184/0534/files/10202419084.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_off00004e8d.bin
448c616cc7c094946c19434b147ef3c6a9575dd4dd7ab0a22bdda629eeb12e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E8D 5288 bytes
font_01_sfnt_off000060b5.bin
e9e6f1f8de5ef684f8cb2384cd0da5c0fdea0269f36502d0e6203fdf73e1b94a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B5 14476 bytes

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