Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cde58e45d1d68b4…

MALICIOUS

PDF

45.0 KB Created: 2020-08-13 22:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbc70e004202a49520cd4e83db774555 SHA-1: 3c4badf03696eb31fdcbc97c9ee421306535f115 SHA-256: 1cde58e45d1d68b4488db7cdcae6032341dc9e3c48cfca82524b8eb5fb219c50
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'one word substitution dictionary free download pdf' and the malicious URL itself, suggesting a lure. The ML classifier strongly indicated maliciousness. The presence of numerous Shopify-hosted PDF links, while some are benign, indicates a potential link farm strategy to improve SEO for malicious content.

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/wb?keyword=one%20word%20substitution%20dictionary%20free%20download%20pdf
    • http://bakep.charlotteacupuncturetherapy.com/uploads/1/3/1/1/131164250/eeb02263f.pdf
    • http://kereno.danielleharth.com/uploads/1/3/1/3/131384281/xavekuxitojiwi.pdf
    • http://files.diamanocoura.org/uploads/1/3/1/1/131163601/wekonadituwexuxu.pdf
    • http://files.5starcustomlures.com/uploads/1/3/0/7/130775241/vivokugivesotan.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/tsc_promotion_appraisal_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/3444/1885/files/uninstall_node._js_mac.pdf
    • https://cdn.shopify.com/s/files/1/0450/6599/4392/files/57772660490.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/lojejofolav.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/faxekaxovilo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1157/0838/files/piper_cherokee_140.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/zomejetanogifoxopekebag.pdf
    • https://cdn.shopify.com/s/files/1/0447/9103/8118/files/sonda_vesical_demora.pdf
    • https://cdn.shopify.com/s/files/1/0433/9472/8103/files/61492744141.pdf
    • https://cdn.shopify.com/s/files/1/0448/0850/3456/files/junut.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005130.bin
4c7eb16558244930dfcdd71bf4ccb5e25a4abbe59370c7262cdaece5266db163		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5130 5392 bytes
font_01_sfnt_off000063a4.bin
1e089e5efc9d32c5656871c9ac5cdf91ccaa66bd10f4886ee85b4f8c67a51eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A4 9876 bytes
font_02_sfnt_off00008579.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8579 4324 bytes
font_03_sfnt_off00009379.bin
9c374d9cc61730b72d24ab7d67e95757c5b8164a0877aac61677cb7fe6d0b962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9379 5252 bytes

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