Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57cc9a54c6768e2…

MALICIOUS

PDF

45.5 KB Created: 2020-09-01 11:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38b6d19cc11d0e8193d03aacaf12f11c SHA-1: 7f3796033b4f825a4172572d0f7fbfc4659acdfd SHA-256: f57cc9a54c6768e213f1266ed138d7e5e91817ea9a60a65f43cec1a8ea74a521
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=autoestima+definicion+pdf, which is likely the primary malicious payload delivery mechanism. Additionally, the PDF contains a mass external link farm, with the first URL pointing to a Shopify domain.

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/wix?keyword=autoestima+definicion+pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70474217151.pdf
    • https://cdn.shopify.com/s/files/1/0465/1086/6582/files/linkedin_summary_template_for_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1010/files/rpg_maker_2000_android_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/4661/6733/files/gipolokixuwumiju.pdf
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/javowoj.pdf
    • https://static.usrfiles.com/ugd/1be480_178dead2320649d28c54a55bdac4efaa.pdf
    • https://static.usrfiles.com/ugd/47b1e8_4938b85dd74c433e93c8e47577af8eb8.pdf
    • https://static.usrfiles.com/ugd/c618e9_54dd60f0f31b45d9a772ab97c5c69941.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c31454b5c9f4623b96c73110c8518bf.pdf
    • https://static.usrfiles.com/ugd/ce5d00_da8e51d1522f46f690b4f1743271e586.pdf
    • https://static.usrfiles.com/ugd/430cb2_bfad02db72f24f5e952541fff4755374.pdf
    • https://static.usrfiles.com/ugd/217d68_bc08b549b8934a88a656a83a4a620bac.pdf
    • https://static.usrfiles.com/ugd/87d215_a7c932d5f3cd4a0cb6f1a603eb7c6f92.pdf
    • https://static.usrfiles.com/ugd/b8c837_92074b9a757c491eba549f6adecaa1e6.pdf
    • https://static.usrfiles.com/ugd/7f16bd_19deab89652146b484a359661167ccb1.pdf
    • https://static.usrfiles.com/ugd/74a852_4bad499708b24a548edfb1efa67eddf1.pdf
    • https://static.usrfiles.com/ugd/eb6612_9f57b591a49e4ba89037bcd21e526a44.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_off000074fc.bin
2c83341027131c5922c9051fcb56edeaab49662bb27f9dd34241f57963e13fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FC 5160 bytes
font_01_sfnt_off0000867e.bin
253058aa107a1332f38eda260a48d53e7357be166db35d35776ec039c4ecbcc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x867E 10524 bytes

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