Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcf188acc0d89db…

MALICIOUS

PDF

51.7 KB Created: 2020-08-31 10:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab3cbad14094d62cc69e94dcd335b3b6 SHA-1: 492d5c75207297af989c0d0e41ee7800b3f219c3 SHA-256: 5fcf188acc0d89dbc9e054148623acb7c1dae1839af281807942299dd169f471
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the same malicious URL and numerous other PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector is a high-confidence indicator of malicious intent.

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/wix?keyword=mackey+s+revised+encyclopedia+of+freemasonry
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0105/2323/files/kinisasoxuribabufeva.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1046/files/massage_intake_form_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/4920/5405/files/dna_template_strand_and_coding_strand.pdf
    • https://cdn.shopify.com/s/files/1/0430/0711/5423/files/fijekabojek.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_76bcaadfdbac4d12af5c07a2d5bcd031.pdf
    • https://static.usrfiles.com/ugd/c8a981_8e27a95f415f4120bc18c0d9bd8789c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_38281d21d2b74252840743180cf1cba7.pdf
    • https://static.usrfiles.com/ugd/61f964_1095661abb36421fae0736e784505019.pdf
    • https://static.usrfiles.com/ugd/b8c837_47f24f7d3fb443b286c869478c059c20.pdf
    • https://static.usrfiles.com/ugd/97634b_1134a3f226234625b040887adc064f6b.pdf
    • https://static.usrfiles.com/ugd/f80014_099930541aef4710b02e884c197a30c2.pdf
    • https://static.usrfiles.com/ugd/a2d007_45cd330320474a99bd77d53e867fa2d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_59faa54f4929421b8ef1af17bd4c860f.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/45624343095.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/jaxebigexukadilizikof.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_off000074ef.bin
ce102bb7633afcd7c7ebae17c5ddf277f5884ae6f5b69705504b7ae6a9bfc983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EF 5240 bytes
font_01_sfnt_off000086af.bin
17ce5e1afdb9bbe70b104102779932aeb5adb1694f04045d8a7cc16c3f5d6342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86AF 14252 bytes
font_02_sfnt_off0000b363.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB363 4324 bytes

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