Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c24f4c54c9a59f…

MALICIOUS

PDF

39.9 KB Created: 2020-08-07 06:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 198b7743103f15773084d2095c317811 SHA-1: 2b6473bc1dcfab48fb78e9bbcb8ed81f8aa077af SHA-256: 83c24f4c54c9a59f9642b7fab80a239ea67d3166a534083ed66e779884639311
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as an Adobe PDF reader installer download. The document body and heuristics indicate a lure to download a potentially malicious file. The presence of numerous links, many pointing to benign Shopify URLs, suggests a link farm designed to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=adobe+pdf+reader+for+windows+10+offline+installer
    • http://files.gogovernors.com/uploads/1/3/1/4/131406762/6528224.pdf
    • http://files.dharmendhaliah.com/uploads/1/3/1/3/131380899/427d7.pdf
    • http://vagomug.loganspeacepark.org/uploads/1/3/1/3/131380600/7990018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0304/3230/files/53867358599.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/12531772475.pdf
    • https://cdn.shopify.com/s/files/1/0437/8125/9421/files/23910704885.pdf
    • https://cdn.shopify.com/s/files/1/0432/5015/5688/files/fetaligabajepugudufod.pdf
    • https://cdn.shopify.com/s/files/1/0430/2667/7913/files/datupawibepoxilos.pdf
    • https://cdn.shopify.com/s/files/1/0435/1993/4628/files/types_of_occupational_health_hazards.pdf
    • https://cdn.shopify.com/s/files/1/0430/4204/6103/files/wepaliwemosorar.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6230/files/lifevurizetijob.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/demav.pdf
    • https://cdn.shopify.com/s/files/1/0432/1856/7335/files/m40_concrete_mix_ratio.pdf
    • https://cdn.shopify.com/s/files/1/0429/3361/6803/files/arthashastra_in_kannada_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/46989264306.pdf
    • https://cdn.shopify.com/s/files/1/0432/1257/0787/files/fegofosupaxu.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_off00005e18.bin
71cce70308adb824a8f4d9aa3b45cc79221137ca4fd9477c76fb6e260b2c769e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E18 5448 bytes
font_01_sfnt_off000070c1.bin
5441b78b7962185db4cf0e71f17c523e839f12bdca4e230a4701342994716b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C1 9900 bytes

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