Malicious PDF — malware analysis report

Static analysis result for SHA-256 19592eb698bc777b…

MALICIOUS

PDF

53.1 KB Created: 2020-08-05 22:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1984e92fc14faee43cdb1dc23858cbd3 SHA-1: 6e6eda27fae202e0c9608cf91f1f99f992bdc99b SHA-256: 19592eb698bc777b4fad3f4d53bab09cf6952dfaeab9e442dee9af8ca6458cb8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to lead users to harmful content. The document body, though heavily obfuscated, contains the text 'New handbook of business english pdf' and the malicious URL, suggesting a lure for users seeking such a document. The presence of numerous external PDF links further supports the SEO link farm heuristic, pointing towards a campaign distributing 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=new+handbook+of+business+english+pdf
    • http://files.douglastilley.com/uploads/1/3/1/8/131871586/tuxofap.pdf
    • http://gevijewe.mydivinewomb.com/uploads/1/3/1/4/131453329/nudironesarakedimu.pdf
    • http://dofebemap.sporcktileart.com/uploads/1/3/0/7/130738993/datoselexi.pdf
    • http://pesuw.thoroughbredheritagehorseshow.com/uploads/1/3/0/7/130776257/7ac76d20287b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/1415/0553/files/gadepupobojixed.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8898/files/siserujer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/571475918.pdf
    • https://cdn.shopify.com/s/files/1/0429/1028/5990/files/negogole.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/honda_trx450r_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9394/1671/files/11162419120.pdf
    • https://cdn.shopify.com/s/files/1/0435/8445/4817/files/2038060251.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6477/files/36068087145.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tuwaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/vanewanimufobifumudag.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/wuziwilaxabinupezenuvovup.pdf
    • https://cdn.shopify.com/s/files/1/0436/7053/6345/files/bofitatidusi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/20546974536.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a72.bin
20e8ae38fd7aa2403a5a03cbbb10372395622efa2edce75cda9fbb20bb1ae5e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A72 5272 bytes
font_01_sfnt_off00008c67.bin
23efc039dd021e4465f15192ac6b150800f9c27ac26e46304c9e088b7b719c36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C67 14388 bytes
font_02_sfnt_off0000b946.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB946 4324 bytes

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