Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3daf5856f138df…

MALICIOUS

PDF

65.2 KB Created: 2020-08-22 11:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ccaf34caf8ff07b04ba8a00765634e2 SHA-1: e5e13dcbe0c973a96d8455e5fc72154ddb71ab81 SHA-256: cc3daf5856f138df7229f630b8c7cb997307f7ff5410d2b7a7198659a0761174
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of external links, many hosted on cdn.shopify.com. One of these links, https://ttraff.ru/pify?keyword=aldous+huxley+pdf, is identified as a known malicious redirector. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious redirector URL strongly suggests a phishing or redirection attack.

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.ru/pify?keyword=aldous+huxley+pdf
    • http://tipup.noblehomeinspections.com/uploads/1/3/1/4/131407736/dujetiviwosekijiji.pdf
    • http://files.velankannisocal.org/uploads/1/3/1/3/131398125/folepesigov.pdf
    • https://cdn.shopify.com/s/files/1/0459/9155/9327/files/muduvawewajeromizugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/ramuv.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/juicy_stakes_poker.pdf
    • https://cdn.shopify.com/s/files/1/0432/1096/5147/files/vunugotuverovip.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8069/files/47587534129.pdf
    • https://cdn.shopify.com/s/files/1/0428/6113/3990/files/99567501260.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/how_to_dump_a_3ds_game.pdf
    • https://cdn.shopify.com/s/files/1/0434/1425/7815/files/20319669920.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_off0000c3be.bin
0eaa2d106b34b8ef6bf3769b7418c9e32c147d41c7f0c85e0b3ee63b724c39b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BE 4984 bytes
font_01_sfnt_off0000d4c2.bin
4b650edf909f5a74561b79d7e0d2e21b789319639849be36e5664117603279b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 10376 bytes

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