Malicious PDF — malware analysis report

Static analysis result for SHA-256 084b88bedb77d6ba…

MALICIOUS

PDF

59.8 KB Created: 2020-08-22 23:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b3c87848159c83d05e9d8f887df0a66 SHA-1: 583d5e2af08038a5016540088247d8743abeb248 SHA-256: 084b88bedb77d6ba39d750e7f9e34e8bb7dead185bdf7bf73d42de50f7e96f4a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to trick users into clicking it. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=active+passive+voice+pdf+in+gujarati
    • http://files.paulsegers.com/uploads/1/3/1/4/131407918/45e264f23d.pdf
    • http://files.911bodyresq.com/uploads/1/3/0/7/130776118/natarudul-wasawebi-pifag-nisaneneduk.pdf
    • http://zomiwesoz.goodshepherdsfoundation.org/uploads/1/3/1/3/131383363/6226364.pdf
    • http://files.simonbrookercoaching.com/uploads/1/3/0/8/130874535/pepemoritulixowejov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.indictrans.org
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/3871/9648/files/46138470531.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/bosopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2269/files/double_addition_worksheets_with_regrouping.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/security_testing_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1287/files/5690765111.pdf
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/fuximurunilokeko.pdf
    • https://cdn.shopify.com/s/files/1/0440/1466/5878/files/kali_linux_wifi_hacking_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9015/7474/files/guzadamalo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2100/7005/files/pdf_to_word_converter_apk_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/0333/7114/files/marriage_certificate_format.pdf
    • https://cdn.shopify.com/s/files/1/0464/5568/5288/files/zefenojawe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007827.bin
eb358b8bb8551f05ca60d1eee24ee48bb5afbb1cd10f57ef2b964da8027b91ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7827 5296 bytes
font_01_sfnt_off00008a3a.bin
2e84605853c6c7aa916f8f9e7d5d2a9517323c815bcc3c39ce4f94d23c29c57f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3A 12356 bytes
font_02_sfnt_off0000b16e.bin
42888a5e5b365f502cf48f9526d25e3a1b242539a18b2a5577790cca9019e1d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB16E 10124 bytes
font_03_sfnt_off0000d3bf.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 4324 bytes

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