Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52d5b0166200f0d…

MALICIOUS

PDF

40.0 KB Created: 2020-08-02 11:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12b2d4ca91446e3e568eb5a8f3ceb538 SHA-1: 42d93930e72680846b36cafabb8fe35949a9a590 SHA-256: f52d5b0166200f0d12159b499c21c314e990bdf6921dfd2bd97bb0471b07762a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged as malicious by an ML classifier and contains a large number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=discord+text+formatting+color'. Another critical heuristic identified a PDF link farm with 19 external links, predominantly hosted on cdn.shopify.com. The document body contains garbled text but includes the same redirector URL, suggesting a lure to a malicious site.

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=discord+text+formatting+color
    • http://files.foreststreetps.com/uploads/1/3/2/7/132712407/zelubanajo.pdf
    • http://files.alexfullermedia.com/uploads/1/3/2/7/132710676/zanarun.pdf
    • http://files.cosmicguloso.com/uploads/1/3/0/7/130776120/limirepidawosik-jutuwufeteruva-mujabopuni.pdf
    • http://files.solotetea.com/uploads/1/3/1/6/131607404/f0b337189b85.pdf
    • https://cdn.shopify.com/s/files/1/0433/6700/6364/files/tuwizajimazubozanolo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8770/files/gumarazidefewoguvowa.pdf
    • https://cdn.shopify.com/s/files/1/0435/9903/6573/files/ximejalafukusevasuna.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/mexifopurotimajegaledagu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/44417825655.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/60851743626.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0435/1298/7802/files/dubefuboworer.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/6749581519.pdf
    • https://cdn.shopify.com/s/files/1/0428/8846/2495/files/77249608893.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/30300118783.pdf
    • https://cdn.shopify.com/s/files/1/0429/1064/6435/files/nivebuzagepavov.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/xivubenejunososikugedafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7601/7559/files/can_t_hold_us_lyrics_macklemore.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000607a.bin
a8d6f26b1d5ecb671794860bbe32516b6237b936ad2b2f43f1616bb11f9fca9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607A 5408 bytes
font_01_sfnt_off000072cf.bin
1c03c93edd8a1cd60f0d0ad9cf56c0051eac317e33915359f568d0d80e00a382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CF 9468 bytes

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