Malicious PDF — malware analysis report

Static analysis result for SHA-256 424ddcaec6ff7c10…

MALICIOUS

PDF

64.1 KB Created: 2020-08-25 23:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d862f767fe0c9abbfdaf6a3cc9de31b SHA-1: 4efabb5968ff67dd1ab53dfae73a284e2c23099e SHA-256: 424ddcaec6ff7c10083bb89ff0fb2e41075a45c1a9db185bf729c6a55e2900b4
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to obscure the final malicious destination, likely a phishing or malware distribution 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=watson+crick+wilkins+and+franklin+wo
    • http://ravifixi.bearsreg.com/uploads/1/3/0/7/130776167/nedotu_nutugimuzisav_tawefogadulotiv_zelobukas.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/7597334387.pdf
    • https://cdn.shopify.com/s/files/1/0450/4292/5726/files/my_way_piano_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8711/files/dukukurowu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/voluwimesekezisasafutodi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/lokigevifav.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/glencoe_algebra_2_textbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7784/5671/files/algebra_de_boole.pdf
    • https://cdn.shopify.com/s/files/1/0437/9197/4549/files/heaven_song_phil_wickam.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/xomotirimukovavizesewesat.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/54248026679.pdf
    • https://cdn.shopify.com/s/files/1/0437/3830/0568/files/78371601410.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_off0000b2b5.bin
73bc8af6ee231923abfb4d2b71f81a46da4025716253c3bd03051c0ca1202c87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 5184 bytes
font_01_sfnt_off0000c478.bin
494b81782ed136857841dcc6d0b2e26a668586a0cb46a40cf4a28de66070f233		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC478 14912 bytes

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