Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e41a574df08fa2b…

MALICIOUS

PDF

43.8 KB Created: 2020-08-18 22:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0afaf1942d67e9a5b1ba0f2ccddd1f7f SHA-1: 1d7474d1935ec1decfeededbf1de39d6d46e1c03 SHA-256: 8e41a574df08fa2b1e674135ec8f8f5d1d08b2b74a0e4afb54384098f9afe9e7
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the text "Virtue ethics journal pdf" and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous other links to Shopify-hosted PDFs indicates a link farm strategy, likely for SEO poisoning or to host further 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.cc/pify?keyword=virtue+ethics+journal+pdf
    • http://files.empowerherct.org/uploads/1/3/1/4/131437736/7de87871851d.pdf
    • http://sasopa.ecamrl.org/uploads/1/3/1/8/131856185/regepu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2070/6204/files/66595787434.pdf
    • https://cdn.shopify.com/s/files/1/0438/6645/6224/files/wapiwepikimum.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5041/files/89302598898.pdf
    • https://cdn.shopify.com/s/files/1/0429/3070/0455/files/problem_solving_approach_to_mathematics_for_elementary_school_teachers.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8137/files/rekefofokajaragutinu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/letowopebofowebizuwir.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/vunud.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/fuxewenalizewupavi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8676/5475/files/bayesian_hypothesis_testing.pdf
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/76318330712.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7362/files/weber_carbs_tuning.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_off00006870.bin
e6e64c0a437970585256471534beb1e9e79fae74d56ac0f931d085e1a5457a4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6870 5284 bytes
font_01_sfnt_off00007a6f.bin
aac097b9a87dea40a12b2f9d42a14824c8b8ac37ca06fdb8dca017611acbe9ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6F 11848 bytes