Malicious PDF — malware analysis report

Static analysis result for SHA-256 db11760e2e978e8a…

MALICIOUS

PDF

46.2 KB Created: 2020-08-12 18:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 394116b025e238373f80d620d3564fe6 SHA-1: 897ca3259e26c3410616f01d0e974993aa1f4106 SHA-256: db11760e2e978e8a2b0538a362472a0746ce4c9e7b3fabac9870583f7946f8f7
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate download links, but the primary link redirects to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to legitimate-looking content, likely to improve SEO for malicious download sites.

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=linux+command+line+pdf+free+download
    • http://files.brackinbladesforge.com/uploads/1/3/1/6/131637656/8023506.pdf
    • http://files.escondidofoundationarch.org/uploads/1/3/2/6/132695200/mirop_videmifajizema_welamegade.pdf
    • http://files.marthasafra.com/uploads/1/3/1/1/131163599/miloseguzudim.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/denasujigafu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/write_your_business_plan_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/4224/2709/files/sowamoverefuxo.pdf
    • https://cdn.shopify.com/s/files/1/0446/7795/5747/files/pencil_art_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lalosukiwafigoledexefes.pdf
    • https://cdn.shopify.com/s/files/1/0429/6605/7116/files/relexevisuxumepepatok.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/gedosizirelomumerid.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8252/files/79986818753.pdf
    • https://cdn.shopify.com/s/files/1/0433/0756/5209/files/38946646811.pdf
    • https://cdn.shopify.com/s/files/1/0439/1324/8923/files/jimanonemabetoj.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/vojekomelu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/cara_buat_cv_lamaran_kerja.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/ridakatisemabokiwize.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006678.bin
804ed8db71cce2299ed7b714f6e80acb08be270be0a93e6e7585c867b9d2b42c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6678 5028 bytes
font_01_sfnt_off00007781.bin
0308a557aea6f4d3d34fbf574afab8513abba5c9da37c335a59abb3681270d1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7781 10808 bytes
font_02_sfnt_off00009bfd.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFD 4324 bytes

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