Malicious PDF — malware analysis report

Static analysis result for SHA-256 71eff6c44532883c…

MALICIOUS

PDF

42.9 KB Created: 2020-08-23 01:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7af0ea7c2ac1651f62e61137396803f SHA-1: 9e51f143bb3a66e8a0506a11e02736cd2375bd8c SHA-256: 71eff6c44532883c4b9010a52408cb0018fa0cc718add950e794775f4c2d39c4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=full+form+of+bams+in+medical+field'. The document body, though heavily obfuscated, contains this same URL, indicating the primary intent is to redirect the user to malicious content. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest a phishing or redirection attack.

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=full+form+of+bams+in+medical+field
    • http://files.myhomeimprovementcareer.com/uploads/1/3/0/7/130775659/fowatorelaxim-wuxupu-nerogivesonow.pdf
    • http://fefix.gandjstarkey.co.uk/uploads/1/3/2/3/132303124/9590287.pdf
    • http://files.marineconservationlab.org/uploads/1/3/1/3/131398504/zofinaketopisogafox.pdf
    • http://wopumejov.childcareandsolutions.com/uploads/1/3/1/4/131453540/5654860.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/2906/1783/files/motor_encoder_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/advanced_excel_vba_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/5439/0687/files/jovupedejokakul.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/10327160240.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/free_ethiopian_fiction_books_in_amharic.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/48363995059.pdf
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/wubemomuraredalowup.pdf
    • https://cdn.shopify.com/s/files/1/0439/4831/0683/files/iskcon_desire_tree_srimad_bhagavatam.pdf
    • https://cdn.shopify.com/s/files/1/0436/2059/7923/files/69915019838.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1786/files/hey_soul_sister_ukulele_chords.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_off00006a37.bin
3ade1af09d88699bb03f49f67b2d62c3f16db99c470e7963834ae48659d4adf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A37 5260 bytes
font_01_sfnt_off00007bfd.bin
efcf7c184d9748e5ffb9fc0e34f62d537606fe14659591c18563a28084a4ec95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFD 10208 bytes

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