Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2ee7a0da4a5560…

MALICIOUS

PDF

42.6 KB Created: 2020-08-11 10:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c94b3cbfb9318caa03ed1147716d6dfe SHA-1: 5004389719905d01f2e4c13c0a49a80cbaa6485b SHA-256: fa2ee7a0da4a55602a5b77d573983d4b08df574333fb942dcc9e3490be7dd591
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and contains a significant number of embedded links, many pointing to external PDF files. One of these links, https://ttraff.com/wb?keyword=criterios%20diagnosticos%20de%20dermatitis%20atopica%20pdf, is associated with known malicious redirector infrastructure. The document body contains garbled text and embedded URLs, suggesting it is not intended for legitimate user consumption but rather as a vehicle for link distribution.

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/wb?keyword=criterios%20diagnosticos%20de%20dermatitis%20atopica%20pdf
    • http://files.winonahouseconcerts.com/uploads/1/3/1/4/131453316/3047006.pdf
    • http://files.nrityayogsutra.com/uploads/1/3/1/4/131482916/55341868.pdf
    • http://sidunirol.spiritlakehermitage.com/uploads/1/3/2/3/132303382/kotowefujakumejozunu.pdf
    • http://files.truespiritcrossfit.com/uploads/1/3/1/8/131872015/ce2ece05.pdf
    • http://files.traceynjohnson.com/uploads/1/3/1/0/131069887/saxex.pdf
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/resumen_del_acuerdo_de_paris.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/alphonso_dunn_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/ziloduxedoxuguripus.pdf
    • https://cdn.shopify.com/s/files/1/0431/2524/4053/files/87692765658.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5971/files/76747870065.pdf
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/zaxifi.pdf
    • https://cdn.shopify.com/s/files/1/0440/4156/8421/files/lekikozigenubebef.pdf
    • https://cdn.shopify.com/s/files/1/0446/7880/7705/files/bomasukupigudapokid.pdf
    • https://cdn.shopify.com/s/files/1/0441/1083/9960/files/hand_car_wash_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4917/files/pengertian_model_addie.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6920/files/c_v_tr_carl_sagan.pdf
    • https://cdn.shopify.com/s/files/1/0434/5154/7800/files/wuwajajuzal.pdf
    • https://cdn.shopify.com/s/files/1/0437/8594/5246/files/21759929064.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_off000063fa.bin
f013b5808456382be6dcb20a987a26fdd16b8542693413da70383bb6caf88d08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FA 5348 bytes
font_01_sfnt_off00007618.bin
fd94079aa3fe12fa61f17da0a480de8f9937cb51fe64af184fd2a22ba0d47dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7618 11460 bytes

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