Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd80c15b61c64c8…

MALICIOUS

PDF

57.3 KB Created: 2020-07-30 22:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfbd0b95d0b6506d86f0032bc3e929ab SHA-1: 4ddfd75d69845146f8b8e50bc5d7643f0e0663d1 SHA-256: fcd80c15b61c64c8ff8d9b43f31c317d949ef500e7d481f985b2f623360e4d49
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.com'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to create a link farm or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=el+alienista+joaquim+machado+de+assis+pdf
    • http://files.jacquelinejanas.com/uploads/1/3/1/0/131069987/ligowuvese.pdf
    • http://files.mudrivercockers.com/uploads/1/3/1/4/131452904/faf675b8c.pdf
    • http://files.newwritersworld.org/uploads/1/3/0/8/130814902/rufujojolakez.pdf
    • http://files.fyrelandcanecorsos.com/uploads/1/3/0/7/130738641/wuminoz_vazeferis_wegawata.pdf
    • http://files.newwritersworld.org/uploads/1/3/0/8/130814902/rufujojolakez
    • https://cdn.shopify.com/s/files/1/0437/9289/2061/files/vodojazub.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/68672817784.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/27971794965.pdf
    • https://cdn.shopify.com/s/files/1/0436/1024/3229/files/30733312002.pdf
    • https://cdn.shopify.com/s/files/1/0434/5852/7397/files/40068975013.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/sulomojelowak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/69320009981.pdf
    • https://cdn.shopify.com/s/files/1/0432/3151/0690/files/fibaligajowopokajebiwulag.pdf
    • https://cdn.shopify.com/s/files/1/0432/0942/5056/files/vugowofiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/koxoxipawomimujejen.pdf
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/79348728339.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/81380999851.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
font_00_sfnt_off000089d2.bin
ac2c44dab798ca47e9449183c7cb630c17170a762be44fef56ed8a83647e5f08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D2 5848 bytes
font_01_sfnt_off00009da1.bin
52cee2fda155f4713268f17c18723c7799e4f4e487c61099ab1ea50f12c9a4a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA1 5340 bytes
font_02_sfnt_off0000afa8.bin
d57467751df601a30adfb20d3b6b385abac2fbed5f56e7bd8eae62103b287f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA8 12476 bytes

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