Malicious PDF — malware analysis report

Static analysis result for SHA-256 226aabdf0a4f1922…

MALICIOUS

PDF

39.6 KB Created: 2020-08-23 06:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3a41249cc2489822f8d3937914f6af5 SHA-1: b88f1fb6c0f35dab5c9948741f51d23b69e86697 SHA-256: 226aabdf0a4f192216ce02ec900f1fd40050ba1c7bba85b6ab81e0a23346cfc6
152 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains a reference to 'Bosch car service logo pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

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=bosch+car+service+logo+pdf
    • http://tiluwami.plateauvalleyanimalhospital.com/uploads/1/3/0/9/130969627/b893b.pdf
    • http://files.theherolabs.com/uploads/1/3/0/9/130969118/16a274e8.pdf
    • http://vavufubu.yeppoonjunglegym.com/uploads/1/3/1/4/131407995/pujamopulilib.pdf
    • https://cdn.shopify.com/s/files/1/0434/3280/4504/files/90946950918.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/dexulalila.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/crecimiento_microbiano.pdf
    • https://cdn.shopify.com/s/files/1/0431/2406/4410/files/44126089305.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/40503459378.pdf
    • https://cdn.shopify.com/s/files/1/0433/3453/3275/files/cela_un_cadaver_exquisito.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5303/files/26643178812.pdf
    • https://cdn.shopify.com/s/files/1/0435/3005/9927/files/nikepunajefiwafug.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9155/files/11062219333.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_off00005d28.bin
7bb5ba300212e6d24cc40c50b926db0bb13eb47241805da5c3ca21e5f2dd8e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D28 5524 bytes
font_01_sfnt_off00006ff8.bin
fe5c52792b6d691a27be507d66dfdbd09a112f88f9ca1b7cbec239882161570d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF8 9988 bytes

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