Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c04143b62792f4…

MALICIOUS

PDF

52.8 KB Created: 2020-08-09 16:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d3f61aa7cd81357a0af81f6c051aedd SHA-1: a649cbfcde82ab5701cdd606b5af174316ecd641 SHA-256: 20c04143b62792f468e6ec7611c48735cdaf0a916e6ea14d9eb1e991767a2f85
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 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'cdn.shopify.com'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking title, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the primary attack vector appears to be the embedded 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.com/pify?keyword=behaviorist+theory+of+second+language+acquisition+pdf
    • http://files.eastbayesl.com/uploads/1/3/1/6/131636808/binutusizepupomog.pdf
    • http://files.chemtutorsg.com/uploads/1/3/0/7/130739495/taxemalubopefo_sedatoviv.pdf
    • http://files.junipertreeboutique.com/uploads/1/3/1/4/131408170/4740651.pdf
    • http://files.paxchristisa.org/uploads/1/3/0/7/130739265/44c1c8.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/critical_thinking_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/0224/7838/files/ronevuxiwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/kadozojabasumakepebuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/puneberun.pdf
    • https://cdn.shopify.com/s/files/1/0436/7086/4025/files/49501647904.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0813/files/uu_sebelum_amandemen.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/zojiwifafew.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/16344608518.pdf
    • https://cdn.shopify.com/s/files/1/0438/2566/0066/files/gakazuwumik.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/89426598603.pdf
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/75405729257.pdf
    • https://cdn.shopify.com/s/files/1/0429/1310/4035/files/73330647229.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/nedugoduzugokik.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_off00008f16.bin
d4a794adc6c12846f6dc5a9e1e3d6b830a7fb34dcfb40fa40ff0613b4e788bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F16 5752 bytes
font_01_sfnt_off0000a2b7.bin
2c9f06ba08448c469c61b8dd398fb4edb2c772663ca20e988f16bec54bebb992		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B7 10204 bytes

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