Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6888d4264ffd8c…

MALICIOUS

PDF

41.4 KB Created: 2020-08-26 00:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b36abae8b26806742341843a43a04e6 SHA-1: 5c11388698a914c4953d937d9d6b5cd627d4dd37 SHA-256: 6a6888d4264ffd8cd3aedd4f791f2ea872979a679a85a327a79b9638cc3e2acd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of external links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to potentially harmful content, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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=artist+of+life+workbook+lavendaire
    • http://files.gcfishandgame.com/uploads/1/3/0/8/130814633/sagavokovaj.pdf
    • http://tasozo.flowersindublin.com/uploads/1/3/1/4/131454215/xidujasawovab.pdf
    • http://pogili.dvelights.com/uploads/1/3/1/6/131606758/826d55e6e32615f.pdf
    • http://files.brpride.org/uploads/1/3/1/3/131384495/vepulufug_xumanawozafizel_gusiwepu_teluruxaf.pdf
    • http://fugigobib.everydayanewstory.com/uploads/1/3/2/3/132303382/bifegok-widifuwe-guzinogame-tamelotif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5897/7178/files/motu_patlu_cartoon_free_2017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7082322425.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0448/0168/7714/files/ministero_della_salute_roma_attestato_di_conformit.pdf
    • https://cdn.shopify.com/s/files/1/0440/8170/9206/files/31457074606.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/14596031122.pdf
    • https://cdn.shopify.com/s/files/1/0429/4819/8556/files/88986539123.pdf
    • https://cdn.shopify.com/s/files/1/0432/6116/5723/files/bamadipuzilonifugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6716/files/grade_2_math_worksheets_addition_and_subtraction.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7428/files/72442217372.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ad.bin
249a47e643f1b525e01ed93de9ef5dff8473ef8749b4c11143fdcfd9e3cad6f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63AD 5248 bytes
font_01_sfnt_off000075aa.bin
6c3b22790a9a9a9405ed0123fbda8a9a4fb6ecb44deddc407ff082d37d54effe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AA 10284 bytes

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