Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1191499c37916fc…

MALICIOUS

PDF

42.3 KB Created: 2020-08-14 23:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 354a8445d3ea816336e38c646b839d58 SHA-1: 905bf6e3cb8db2ff9c1701e74aef53f42821db97 SHA-256: b1191499c37916fc4ab1e3dd3f8c60961fa47ef0608ec3cac0cca3918a20b3df
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used to create link farms for SEO manipulation or to host phishing lures. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=walmart+bed+sheets+full'. The document body, though heavily obfuscated, also contains this URL and references to 'Walmart bed sheets', suggesting a lure to a potentially malicious shopping-related page. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=walmart+bed+sheets+full
    • http://files.brownisland.net/uploads/1/3/1/3/131383964/gavewibogegorumir.pdf
    • http://files.thedrawingboardnyc.com/uploads/1/3/0/7/130739076/sapebubasisomamuj.pdf
    • http://files.gfwcncdistrictfour.org/uploads/1/3/2/8/132814166/c11ce90858c9.pdf
    • http://tetewin.texasrockclimbing.org/uploads/1/3/1/1/131164250/5712035.pdf
    • http://xabes.highheartcrystalhealing.com/uploads/1/3/2/6/132695535/pukitowipaketu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3522/1403/files/94147061314.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1624/files/girabelu.pdf
    • https://cdn.shopify.com/s/files/1/0448/3697/8850/files/ipad_annotation_apps.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0639/files/types_of_negative_feedback_amplifiers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5712/7336/files/way_of_the_cobalt_soul.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/vanivusuvimubus.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/how_to_jailbreak_apple_tv_3.pdf
    • https://cdn.shopify.com/s/files/1/0440/8701/7637/files/docs._jboss._org_hibernate.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/36125592714.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0954/files/57445631397.pdf
    • https://cdn.shopify.com/s/files/1/0437/0608/9640/files/canard_enchain_gratuit.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_off000067cb.bin
d669a4887af4968ba6f2c52ab1aec24c6313edbb6ce2cabd6b3ac3d196fcf046		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CB 5300 bytes
font_01_sfnt_off000079b6.bin
812c72dd23161adc7e3d00725d1455d08395fd009a91e3ef0ec6dc39bbb1ec29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B6 10140 bytes

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