Malicious PDF — malware analysis report

Static analysis result for SHA-256 487c9155d2435537…

MALICIOUS

PDF

42.0 KB Created: 2020-08-14 14:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 253d19c953a5d0a07943724d24a11974 SHA-1: 7797a4de281f77d16490c9d3a293cce5c2d39595 SHA-256: 487c9155d2435537b4866261b12e94957eab89148d60b2e2d5667f3a19fcff3d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body text, while appearing to be a worksheet, is likely a lure to disguise the malicious intent of redirecting users to potentially harmful sites. The ML classifier strongly supports the malicious verdict.

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=relative+pronouns+worksheet+grade+6+pdf
    • http://files.carsontidwell.com/uploads/1/3/1/4/131438249/mumiv.pdf
    • http://files.dakotahurley.com/uploads/1/3/0/8/130814258/tabetisifekibi_pibemil.pdf
    • http://files.manuseva.org/uploads/1/3/0/7/130775229/sudepuwati-jomina.pdf
    • http://files.foryourmilitarymarriage.com/uploads/1/3/2/6/132681836/2f4ef6d.pdf
    • http://nojos.robertjrevell.com/uploads/1/3/1/4/131454165/xuzesudux-dafonuwotibiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6453/2900/files/pdf_to_word_file_converter_online_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8913/files/kagonekarusibezuxaxozal.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/calculus_of_variation_by_a_s_gupta.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1207/files/xomekikipazabedemeviwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1096/5147/files/forevupe.pdf
    • https://cdn.shopify.com/s/files/1/0427/9877/6487/files/30010080551.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6042/files/91184993861.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/wogeba.pdf
    • https://cdn.shopify.com/s/files/1/0437/6097/6021/files/58803772591.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6053/files/70729381380.pdf
    • https://cdn.shopify.com/s/files/1/0437/9072/9377/files/jidun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000580e.bin
2acf451ab38c717760b1df6c43b7c676dd2f12279c3c27b5bf1d6230117974f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x580E 5564 bytes
font_01_sfnt_off00006b0b.bin
18c88067186a945fd56e3116d3269fcabc9cffbd627b5adcbc29e60376c6955b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0B 9940 bytes
font_02_sfnt_off00008d15.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D15 4324 bytes

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