Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da77771d7452691…

MALICIOUS

PDF

47.0 KB Created: 2020-08-20 23:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7be5dbd011e47f5bc9a739c4b576244 SHA-1: 48057e51d4c79cb9617e109025204a62ceaee698 SHA-256: 6da77771d7452691cf96a713a6d69804ee732dbf9e01932db3996d90bacb208c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely used to funnel victims to malicious content.

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=mobogenie+android+8.+0
    • http://pagake.sherrisdancecenter.com/uploads/1/3/2/3/132302780/8249209.pdf
    • http://files.bellairecapital.com/uploads/1/3/1/4/131407469/5527766.pdf
    • http://files.labellavitaitalia.com/uploads/1/3/0/7/130739783/bosazazawo.pdf
    • http://vatajopav.jerseycarpets.com/uploads/1/3/1/4/131438344/7767250.pdf
    • https:///plus.google.com/communities/107051382501457940803//plus.google.com/communities/107051382501457940803
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6832/6042/files/binary_to_gray_code_conversion.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/30618299509.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/odisea_homero_gredos.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3481/files/loxobamarunofogomatanis.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/remove_metadata_from_mac.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/arduino_coding_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0433/6641/6549/files/91662235651.pdf
    • https://cdn.shopify.com/s/files/1/0434/2926/5564/files/98660282440.pdf
    • https://cdn.shopify.com/s/files/1/0437/3728/4762/files/gurupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5143/3627/files/sociological_concepts.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/fakav.pdf
    • https://cdn.shopify.com/s/files/1/0427/8625/9100/files/43237850409.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4013/files/sumilixetupa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/75996693640.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062d7.bin
510370390e67f33f175938ffd69142a658da46e18c19be05c510dc66a14d08bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D7 5296 bytes
font_01_sfnt_off000074f0.bin
42a97f617572f0a32ca4740190b7caf695da010c590864c2a92cb7c50430179a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F0 10744 bytes
font_02_sfnt_off000099d6.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99D6 16092 bytes

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