Malicious PDF — malware analysis report

Static analysis result for SHA-256 7396f005b3c4cfdc…

MALICIOUS

PDF

43.9 KB Created: 2020-08-07 20:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 991fd21f70eb96a67ad9df9044deb213 SHA-1: 3d5ea6c2a6217accc762776be858c8c3fcebf4b2 SHA-256: 7396f005b3c4cfdcb381c1efbcd9f00c78cde13bfe0e9ae3fe31308e88c9a677
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though heavily obfuscated, contains text related to a medical procedure, likely serving as a lure. The presence of numerous links suggests an attempt to drive traffic to malicious infrastructure, potentially for phishing or malware distribution.

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=male+catheterization+procedure+pdf
    • http://files.michalsladek.com.au/uploads/1/3/0/9/130969545/8698911.pdf
    • http://files.lakecountyrecovers.com/uploads/1/3/0/7/130775813/tajubodoxamosisotix.pdf
    • http://files.flashlighthut.com/uploads/1/3/1/4/131483219/mufurematasi_dagewofi.pdf
    • http://files.phonecharmed.com/uploads/1/3/1/8/131871780/c53bd33251.pdf
    • http://files.mimisbooksandmore.com/uploads/1/3/0/8/130874526/2046700.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0213/3656/files/ledizakixuke.pdf
    • https://cdn.shopify.com/s/files/1/0435/0928/5024/files/bser_10th_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/0035/6251/files/97109302763.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/tipufo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7285/5957/files/books_in_english_for_teenager.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/bopofo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/35200703512.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4980/files/41431851397.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/21462276156.pdf
    • https://cdn.shopify.com/s/files/1/0428/3482/1287/files/26224260576.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/39770430269.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006118.bin
b31637dc24b0c524f0c23c51eb4f3ed61e3ac94ca74a419f485f03f7fd812369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6118 5004 bytes
font_01_sfnt_off00007211.bin
ee48df76489bc8f3defa9ab8c7533827249dc99a622960c57d5354cbfb00ce43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7211 10060 bytes
font_02_sfnt_off00009466.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9466 4324 bytes

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