Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f64ddb935a06887…

MALICIOUS

PDF

58.8 KB Created: 2020-08-10 07:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fde09437ff523f646d3728a6e6624fce SHA-1: 5de7ab92ed3f72a65f13d2c893ed45905ddf2f23 SHA-256: 9f64ddb935a0688755f9621dc4642951c1e9781a1366dd50997ef8e546e63e5e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same suspicious URL, indicating a deliberate attempt to redirect users. The ML classifier strongly supports the malicious nature of this PDF.

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=belajar+bahasa+arab+al+quran+pdf
    • http://files.kallenakucers.com/uploads/1/3/2/6/132695633/9411889.pdf
    • http://files.meralomabikeclub.ca/uploads/1/3/2/7/132710491/7211618.pdf
    • http://nazijolu.nicolettabuildingcontractors.com/uploads/1/3/0/8/130814328/ronovurevibemor.pdf
    • http://files.andreafarmeraprnllc.com/uploads/1/3/1/4/131483344/joluvaradum-sofofesileba-tazidojika-dulutuzefirized.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/pubolotitidos.pdf
    • https://cdn.shopify.com/s/files/1/0433/3876/0342/files/piwogumules.pdf
    • https://cdn.shopify.com/s/files/1/0438/9961/7448/files/62979296677.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/lanimerukipasiroxube.pdf
    • https://cdn.shopify.com/s/files/1/0433/5684/8282/files/valvular_heart_disease_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/vexegubojize.pdf
    • https://cdn.shopify.com/s/files/1/0428/2014/1223/files/wunevetutek.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/1324201523.pdf
    • https://cdn.shopify.com/s/files/1/0431/7570/6788/files/29125464162.pdf
    • https://cdn.shopify.com/s/files/1/0434/6934/0822/files/suvozogoribizogibararitub.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/xenutuzuleka.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/37472312491.pdf
    • https://cdn.shopify.com/s/files/1/0430/8680/7201/files/vokikuzatodudoxiji.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000b12c.bin
3e9bef805c5f8ab7b106e5397f8759d1dffc198350241e1d1675472fdfabd466		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB12C 25432 bytes
font_00_sfnt_off000079b2.bin
d1796263591cf2ec6fc767b5cf1a6bed711775089b9235ec9e8e0129c2decd14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B2 5520 bytes
font_01_sfnt_off00008c6b.bin
814ce480a24e4c796550d39c2c666b2a7f80d9c32a8aa703fb935abf6f710c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6B 10764 bytes

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