Malicious PDF — malware analysis report

Static analysis result for SHA-256 b945355ae22a6cc1…

MALICIOUS

PDF

41.6 KB Created: 2020-08-05 09:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3200c66f8bae6a8472dfb9921d348327 SHA-1: 062bd0dbf29f77e6f1fac77889d2f703945b308e SHA-256: b945355ae22a6cc1e5fee585f782fbff6874391bf7b26a178244c1e36818f3f8
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=modern+definition+of+accounting+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'https://cdn.shopify.com/s/files/1/0434/0324/7781/files/gawitale.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting the primary intent is to trick users into visiting this malicious link.

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.cc/pify?keyword=modern+definition+of+accounting+pdf
    • http://files.jumpinrealestate.com/uploads/1/3/1/4/131452838/xesakasonibuv_bozuzipa_zudujer_sabuzumixad.pdf
    • http://files.northbattlefordhomehardware.com/uploads/1/3/2/6/132681969/27968c5195.pdf
    • http://files.pittsborotoys.com/uploads/1/3/1/3/131383646/2273492.pdf
    • http://files.cloud509ml.com/uploads/1/3/1/1/131164024/xodojolozebop.pdf
    • http://files.kefaloniatravel.net/uploads/1/3/1/4/131407521/vijopivedi-vaxewomiwunis.pdf
    • http://files.pittsborotoys.com/uplo
    • https://cdn.shopify.com/s/files/1/0434/0324/7781/files/gawitale.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/olsat_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9078/files/canadian_visa_application_form_5257.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5632/files/59469664186.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/2596902398.pdf
    • https://cdn.shopify.com/s/files/1/0433/0618/8955/files/sapifoju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22411539251.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/dorisokafutogumowuberej.pdf
    • https://cdn.shopify.com/s/files/1/0439/9969/0910/files/77353505478.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/29407932706.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/81824896219.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/pidenelarelox.pdf
    • https://cdn.shopify.com/s/files/1/0440/8197/1365/files/80348970299.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_off000065d7.bin
2547ccd937d78aa9e69a0bc0171e3a7f3344e32488d1384889a98f851bed176c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D7 5116 bytes
font_01_sfnt_off00007761.bin
a2df0f3379e916de8565a77ae1c4506a32a16924e8052b12553345ec69b89a59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7761 9884 bytes

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