Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33f5bf220a9559b…

MALICIOUS

PDF

42.2 KB Created: 2020-08-11 23:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fda65fd925402119a6f929288dbf89b SHA-1: b078c19c67825c1c7f411a4f14a8bf10c033989e SHA-256: f33f5bf220a9559bcd7d80b62a5b15f0d3c34111722c47920c6091b1bbf360bc
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/pify?keyword=business+writing+today+canavor+pdf', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and a large number of other URLs hosted on various domains, suggesting a link farm designed to distribute malicious content or phish users.

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.ru/pify?keyword=business+writing+today+canavor+pdf
    • http://susajowag.loveromancereads.com/uploads/1/3/2/6/132681245/97482927e10d1de.pdf
    • http://savog.propertyinpizzo.com/uploads/1/3/1/0/131070374/f8f23ff.pdf
    • http://files.terrehaute.com/uploads/1/3/2/8/132814427/a58372c7840527.pdf
    • http://files.streetervillepediatrics.com/uploads/1/3/2/7/132741385/2d483f.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/bawaduwulekomupipuzoto.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/gakebeku.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/92466529482.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/important_physics_constants.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/wogavejixesigukitegis.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1160/files/symmetric_and_asymmetric_key_cryptography.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zutazalurofesavasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/ximexarigidezeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/2430/8630/files/tawafinajuzixamowar.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/38937772424.pdf
    • https://cdn.shopify.com/s/files/1/0430/0747/5875/files/4289372762.pdf
    • https://cdn.shopify.com/s/files/1/0446/3663/5299/files/antioxidantes_enzimaticos_e_no_enzimaticos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.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_off00006693.bin
01bc8e9dcf4616dbd0a54ed377910dc4f3cbd966880ff8915ede7c6071014cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6693 5592 bytes
font_01_sfnt_off000079c9.bin
c3a0406c59cf7fcd4de054e97f0170dd7ab98fa20106345661e54c60e171e9a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C9 10040 bytes

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