Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e20f51d02f2dcff…

MALICIOUS

PDF

120.6 KB Created: 2020-08-03 19:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a2515c6bec9d9295335a6b32d3ef79e SHA-1: 3c1fe848d96eb78f1fbf03b13d5c6907ae204635 SHA-256: 9e20f51d02f2dcff00fcf5e6b064be028a7d982eee73f9b59eba8841176ec0e1
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=relation+of+demography+and+economic+development+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its malicious intent.

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=relation+of+demography+and+economic+development+pdf
    • http://files.creativconcepts.studio/uploads/1/3/1/3/131383657/winakekejazobuxipomo.pdf
    • http://files.adimef.com/uploads/1/3/1/3/131383657/1298471.pdf
    • http://files.ecocaregreen.com/uploads/1/3/1/3/131384468/pavefofat.pdf
    • http://files.studioviemen.com/uploads/1/3/1/4/131453429/1997700.pdf
    • http://files.castcoverstasmania.com/uploads/1/3/1/6/131637498/xisireg_tusafamubepip_rajajosonarob.pdf
    • https://cdn.shopify.com/s/files/1/0449/3528/2856/files/yamaha_v_star_650_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/lavevezogozatilufuxunok.pdf
    • https://cdn.shopify.com/s/files/1/0434/7209/3336/files/19323487076.pdf
    • https://cdn.shopify.com/s/files/1/0436/2423/5170/files/fiwizetipojaserozilo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/wewerureku.pdf
    • https://cdn.shopify.com/s/files/1/0434/2025/4375/files/vufitesex.pdf
    • https://cdn.shopify.com/s/files/1/0428/6654/0700/files/osrs_archer_helm.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/survive_martial_law.pdf
    • https://cdn.shopify.com/s/files/1/0438/6013/2005/files/30434975180.pdf
    • https://cdn.shopify.com/s/files/1/0430/4191/5042/files/fm_3_21._5.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/curso_de_violo_popular.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7278/files/vokunikexamol.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/8641896289.pdf
    • https://cdn.shopify.com/s/files/1/0430/6809/6661/files/22701242830.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_off00018ca1.bin
cd7185ccf6e0c1d52c51a8474fe182700cf63b1b8fb4277b3aa1e389c2fc0005		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CA1 5560 bytes
font_01_sfnt_off00019f81.bin
1ee89159bb4159d61bbccee5b3479a88078704317dc51ccaf70a2f7799eb9fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F81 16804 bytes

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