Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee28d70e2cc1a10…

MALICIOUS

PDF

50.7 KB Created: 2020-08-31 03:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28605fbc1bdbed178671b5d76e72b8d2 SHA-1: a02e290f27c34e4a5275ed6b36e0c163e011e633 SHA-256: aee28d70e2cc1a1091d89fe9ec860713f231fef492f506190529c5c4bc764f31
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a large number of embedded links, including a critical finding of a malicious redirector link to 'ttraff.cc'. The document body, though partially corrupted, contains text related to 'Sobre la libertad frases' and mentions 'wkhtmltopdf', suggesting a lure document. The primary attack pattern involves redirecting users to malicious infrastructure via these numerous links, likely for phishing or malware delivery.

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/wix?keyword=sobre+la+libertad+frases
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/jotowofanigigijava.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/moxovotofotowase.pdf
    • https://cdn.shopify.com/s/files/1/0435/6161/5519/files/76353679905.pdf
    • https://static.usrfiles.com/ugd/6350c7_aa6dea257c3241ba9b491090bb5feeeb.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_d21a0ee5d8ab416fa2da8afe3f224331.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_198fdaa24e4e42119b525aae197a4de1.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac000b7685f14196bf4bad74d22ef237.pdf
    • https://static.usrfiles.com/ugd/c0b427_71e48e0ce554403c9667f61b04a97535.pdf
    • https://cdn.shopify.com/s/files/1/0431/2819/3184/files/53875311320.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/austria_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/pobez.pdf
    • https://cdn.shopify.com/s/files/1/0438/3562/1526/files/friends_songs_masstamilan.pdf
    • https://cdn.shopify.com/s/files/1/0438/9430/9019/files/9908899908.pdf
    • https://cdn.shopify.com/s/files/1/0440/1712/3493/files/astm_paint_and_coatings_standards.pdf
    • https://cdn.shopify.com/s/files/1/0465/1941/9038/files/sumazoxinukidajevesameza.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1589/files/falowijakinogagatasisijem.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_off000078fa.bin
2ac5ec53bcc4b92e7b3bbc5b826cfe6f0a88bdc85b2bab5bbc82cd36f269c143		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78FA 4828 bytes
font_01_sfnt_off00008961.bin
c043ebb6c0b0ee72c1fb0d9a38d471af4ec53d70057db09b0b0eab39bc011b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8961 11392 bytes
font_02_sfnt_off0000ae45.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE45 4324 bytes

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