PDF malware analysis — malicious · bf9c9288359fa985

MALICIOUS

PDF

58.0 KB Created: 2020-09-04 07:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d3486125ba5f8d7c3fe0fe91de01df6e SHA-1: 1186463655c4ed8006e11e0190eca7191c4c3c14 SHA-256: bf9c9288359fa985a4a5da77ac8ef917c9653a91591e11803b2c0c9f900dce48

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits characteristics of a link farm or SEO manipulation scheme, embedding a large number of external links, many pointing to other PDFs. One of these links, https://ttraff.me/pify?keyword=gejala+hepatoma+pdf, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.me/pify?keyword=gejala+hepatoma+pdf
- https://cdn.shopify.com/s/files/1/0432/6942/3269/files/graphing_trig_functions_test_study_guide.pdf
- https://cdn.shopify.com/s/files/1/0431/7573/9553/files/subordinating_conjunctions_worksheet_for_4th_grade.pdf
- https://cdn.shopify.com/s/files/1/0432/3488/5796/files/dwell_among_us_shekinah_glory_free.pdf
- https://cdn.shopify.com/s/files/1/0432/9753/8203/files/54607598269.pdf
- https://cdn.shopify.com/s/files/1/0430/9562/1781/files/obligations_and_contracts_by_hector_de_leon_download.pdf
- https://cdn.shopify.com/s/files/1/0435/3081/3592/files/rexipowuxejebibolo.pdf
- https://static.usrfiles.com/ugd/e32576_f614e995748b473d97eca6804f6eb653.pdf
- https://static.usrfiles.com/ugd/599026_05d015f304794f0b95a7b8af1d26a746.pdf
- https://cdn.shopify.com/s/files/1/0435/4162/7029/files/ignou_bshf_101_solved_assignment.pdf
- https://cdn.shopify.com/s/files/1/0434/3057/6278/files/31677824428.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00008f61.bin` `e01c35f6fb71cb006d39aa35f920f4f9671c5c510bc42f85f02bfd718b128077`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F61	4748 bytes
`font_01_sfnt_off00009fa4.bin` `26f9390e64eb496bd413d529a76554efdff44e3b5cdfa750e42e4a63478c6417`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9FA4	14656 bytes
`font_02_sfnt_off0000cd99.bin` `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD99	4324 bytes

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