Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb52d8dc4f519b55…

MALICIOUS

PDF

51.3 KB Created: 2020-08-06 04:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e858ea28e23e5acdc929d7894d605e21 SHA-1: a37fdd21a1cfab3c622ed44a79d735798adf67b9 SHA-256: cb52d8dc4f519b55e68b0e59878eced28a8c9a398acf1a5a4fa7f51f2edabba6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=aditya+hrudayam+stotram+lyrics+in+tamil+pdf', suggesting a lure to disguise malicious activity. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates a likely phishing or malware distribution attempt.

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=aditya+hrudayam+stotram+lyrics+in+tamil+pdf
    • http://files.summitbuilders.us/uploads/1/3/0/7/130738779/1f120.pdf
    • http://files.granolaee.com/uploads/1/3/2/6/132681501/6995364.pdf
    • http://files.simplydivinesuds.com/uploads/1/3/1/4/131407812/23f3d849.pdf
    • http://files.sperographix.com/uploads/1/3/1/4/131406403/xawuvu-guxetigo-kumilukokevunex-genodezojeja.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/39122412655.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/podufa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/sevajejitipej.pdf
    • https://cdn.shopify.com/s/files/1/0428/0310/1863/files/41209310463.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/rapuxawefusevis.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1635/files/vasezofemevaken.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/sakoganab.pdf
    • https://cdn.shopify.com/s/files/1/0434/7225/7181/files/pokopixutonutax.pdf
    • https://cdn.shopify.com/s/files/1/0434/5177/7185/files/giligumuzuzilatukaji.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_off00007402.bin
9a077a59fc7b9c4547fc86cc225b9f03fc851f38f178b4c94d383c181d83fec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7402 5248 bytes
font_01_sfnt_off000085b4.bin
fd0baac36cf8fc893687cbe6b3b8165417b6c4fca046c9a5e64821bfdf5295b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B4 2140 bytes
font_02_sfnt_off00008f28.bin
57d88c34134c75073613bcadb864037574e0f584527c973b931d373b15ab0ca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F28 10828 bytes
font_03_sfnt_off0000b1fc.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FC 4324 bytes

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