Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfb4fc8c9d732d7…

MALICIOUS

PDF

41.5 KB Created: 2020-08-07 21:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c938c5280f72ab151f0fae927146b689 SHA-1: f980161099e8a227671b08898ab0a70f45ccf8c5 SHA-256: ecfb4fc8c9d732d78f20ed65fd7dcda97c648685ed2c359b0ae7027870fcc521
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to what appears to be a link farm designed to mimic legitimate PDF downloads. One prominent URL, https://ttraff.com/pify?keyword=concurrency+in+go+by+katherine+cox+buday+pdf, is identified as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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=concurrency+in+go+by+katherine+cox+buday+pdf
    • http://files.thetruthresource.org/uploads/1/3/1/0/131070452/bovapozimate.pdf
    • http://files.slicklimo.com/uploads/1/3/1/3/131380870/vefinul.pdf
    • http://rukom.harrisburgelementary.org/uploads/1/3/1/4/131453177/zuzogetasozulisekil.pdf
    • http://wasemixut.holisticcoachsg.com/uploads/1/3/1/3/131380429/8c39cd62a4a6.pdf
    • http://wusemum.ofhslibrary.com/uploads/1/3/2/7/132710797/ravizovilunaw_pizikiwipe_fanapilig_zutuvojunu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4178/2950/files/52788483555.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8266/files/navuz.pdf
    • https://cdn.shopify.com/s/files/1/0438/0780/1504/files/holt_mcdougal_algebra_1_assessment_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/97491075454.pdf
    • https://cdn.shopify.com/s/files/1/0430/9080/4885/files/90300889420.pdf
    • https://cdn.shopify.com/s/files/1/0434/6943/9141/files/composition_centesimale.pdf
    • https://cdn.shopify.com/s/files/1/0436/8901/7497/files/statistics_agresti_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/5697/2455/files/85141218121.pdf
    • https://cdn.shopify.com/s/files/1/0434/7599/2728/files/wetufo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6630/8246/files/bls_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/4475/6901/files/duwekogipisuwopitagoruz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9966/0194/files/nakoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/sades_headphone_drivers.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_off00006291.bin
c023d47384a80fb85c572645d7c5d5f419fcc37803d7e914d3a009fecfcede7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6291 5484 bytes
font_01_sfnt_off00007541.bin
6c6638430368336ef93dcdde7ca364badfda7472adbd22bc8f8c6c05e21af1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7541 10512 bytes

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