Malicious PDF — malware analysis report

Static analysis result for SHA-256 77862eae8d535a05…

MALICIOUS

PDF

39.1 KB Created: 2020-08-13 14:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a260e698f927a59c0baaec611c5c8513 SHA-1: 846ab877eb0bf4a16f6e90da9cd4ab49943adab5 SHA-256: 77862eae8d535a05892afe2db1f4ed62a1f31755827e41c11130c4770165fd44
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to link farms and one specifically to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a phishing or redirection scheme to lead users to 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.com/wb?keyword=reported%20speech%20commands%20pdf
    • http://vupimiw.chargerchoir.com/uploads/1/3/2/8/132814930/fe9958c.pdf
    • http://files.writinginarowhouse.com/uploads/1/3/1/4/131438611/xivosajigotozusafope.pdf
    • http://files.cannabisandhemp.org/uploads/1/3/0/8/130874359/botexifonixi-kalurakeresap-pubuxuzujovejo.pdf
    • http://files.primroselane.com/uploads/1/3/0/8/130874162/zamagoxipo.pdf
    • http://xisowuler.nomnomnatural.com.au/uploads/1/3/2/8/132815028/dalumebufobu-nupirenejaku-wisoxasow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/scientific_names_of_common_plants.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5710/files/altaf_hussain_hali_books.pdf
    • https://cdn.shopify.com/s/files/1/0451/1825/9365/files/kanye_west_flashing_lights_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0439/4231/4152/files/pasta_recipes_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3100392900.pdf
    • https://cdn.shopify.com/s/files/1/0435/7865/4883/files/mafiluluxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/puwagerafinokotanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/51278650043.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/sixuferejadekusaxujipibez.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2102/files/nanomaterials_applications.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/80509903322.pdf
    • https://cdn.shopify.com/s/files/1/0432/6221/4304/files/84601325610.pdf
    • https://cdn.shopify.com/s/files/1/0437/1133/2503/files/small_to_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/66546958769.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_off00005acf.bin
11f5be0b16bec0eac90abee9d6c9a229ede164ef69765fa64f73fd9327d4332a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACF 5368 bytes
font_01_sfnt_off00006cf2.bin
b84296d513416bca0f395f3f0ac2eac9ae363ef11dac9c718abbca0e0b4d05bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF2 10008 bytes

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