Malicious PDF — malware analysis report

Static analysis result for SHA-256 d540388d4b55fc9d…

MALICIOUS

PDF

43.6 KB Created: 2020-08-08 17:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c1ef0ea8a57f683850e93b3444544e3 SHA-1: e5aaba8884468824cde5e32cb983370ff8b6dd3b SHA-256: d540388d4b55fc9dce4826b7c7ba38076e19eb829ab115b871b44b71a11d58bb
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to Shopify domains which are likely part of a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=adjectif+verbal+pdf'. The document body contains garbled text but also includes the same URLs, suggesting a deliberate attempt to obfuscate the malicious intent while still providing the redirect links. No scripts were extracted from this sample.

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=adjectif+verbal+pdf
    • http://rosibe.rscharters.com/uploads/1/3/1/0/131070331/zapevipuvalovox.pdf
    • http://werizum.littlefresh.com.au/uploads/1/3/1/4/131454549/2897837.pdf
    • http://files.flex-sander.com/uploads/1/3/2/6/132682655/jelobujukipakolok.pdf
    • http://files.stateofbalancementalhealthcounseling.com/uploads/1/3/1/4/131437576/zakefupi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2432/files/dubebirelimoti.pdf
    • https://cdn.shopify.com/s/files/1/0429/0412/5599/files/pijapixitawadem.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/25364274876.pdf
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/jisesozaxixofigiwivevo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3408/files/behaviour_therapy_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2133/files/36569244596.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5025/files/wibim.pdf
    • https://cdn.shopify.com/s/files/1/0449/5589/3928/files/tb_adenitis.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7592/files/yaseen_malayalam_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/sufijavutevesunade.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8375/files/54103458403.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_off00005f5f.bin
fea8caea329173d22b9309bd83e067b66e2a318c37d9841d81093a8e561817f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5F 3372 bytes
font_01_sfnt_off00006b78.bin
a3ae7b0216485dbd851f7b48672ca30a868ba0c3dd1aa8c73a536b49d9121cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B78 5236 bytes
font_02_sfnt_off00007d66.bin
037f0d51458400c9e69156cf4486988fff738c4485c9a9f775afe5b31c83185d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D66 10660 bytes

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