PDF malware analysis — malicious · 82df302fa2c94683

MALICIOUS

PDF

42.4 KB Created: 2020-08-13 06:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e929280dab3f55fce99d6d93d6d0cee4 SHA-1: cfd206cee9f57f8e17abeca87937f91c42731f0d SHA-256: 82df302fa2c9468310039caf4794a3e713d29707c0c97b4dc5a30b9497e39b03

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm and a critical redirector link pointing to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains the primary malicious URL, suggesting an attempt to redirect the user to a compromised site for further exploitation.

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/wb?keyword=ethics%20upsc%20pdf
- http://files.gammaetaomegaaka.org/uploads/1/3/1/6/131636990/5608641.pdf
- http://files.andybutfoy.com/uploads/1/3/0/7/130738779/sajujusigim.pdf
- http://files.cswithwhitlock.com/uploads/1/3/1/4/131406234/zufanumur.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0434/2644/7525/files/95726138619.pdf
- https://cdn.shopify.com/s/files/1/0437/7932/6110/files/ielts_writing_task_2_free_download_2020.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.pdf
- https://cdn.shopify.com/s/files/1/0435/9369/5391/files/95874362674.pdf
- https://cdn.shopify.com/s/files/1/0436/6086/9785/files/anemias_classificao.pdf
- https://cdn.shopify.com/s/files/1/0429/3391/1705/files/58901803940.pdf
- https://cdn.shopify.com/s/files/1/0430/8788/8551/files/92415753603.pdf
- https://cdn.shopify.com/s/files/1/0431/7646/0447/files/cch_chuyn_file_thnh_hnh_nh.pdf
- https://cdn.shopify.com/s/files/1/0428/3318/2886/files/mind_body_therapy.pdf
- https://cdn.shopify.com/s/files/1/0435/9094/2888/files/25497906236.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006958.bin` `bc10c49a4a58e6ab4b6ba7161cea05781122146f0d7b0dd05fe7679a565f707f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6958	4864 bytes
`font_01_sfnt_off000079e8.bin` `0027d3edcbc6ee644ca241567fb8d947256ce2ef61206d0f7a3f3f22042e87d7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x79E8	10600 bytes

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